Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions |
3 Months Ended |
6 Months Ended |
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
Beginning balance, net derivative assets (liabilities) |
$ (1.8)
|
$ 0.9
|
$ 13.5
|
$ 5.5
|
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) |
$ (11.1)
|
$ 0.3
|
$ (27.8)
|
$ (4.7)
|
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) |
$ (0.1)
|
$ 0.8
|
$ 1.2
|
$ 1.2
|
Transfers out of Level 3, net derivative assets (liabilities) |
(0.1)
|
|
|
|
Ending balance, net derivative assets (liabilities) |
(13.1)
|
2.0
|
(13.1)
|
2.0
|
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) |
(12.6)
|
0.9
|
(30.6)
|
(3.6)
|
Gross purchases, sales, issuances and settlements |
|
|
|
|
Purchases, net derivative assets (liabilities) |
0.2
|
0.1
|
0.9
|
0.3
|
Sales, net derivative assets (liabilities) |
(0.3)
|
0.7
|
0.3
|
0.9
|
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) |
(0.1)
|
0.8
|
1.2
|
1.2
|
Investment and universal life contracts |
|
|
|
|
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
Beginning balance, liabilities |
(522.7)
|
(174.7)
|
(578.4)
|
(115.5)
|
Total realized/unrealized gains (losses) included in net income, liabilities |
$ (192.4)
|
$ (17.2)
|
$ 1.0
|
$ (60.6)
|
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Net purchases, sales, issuances and settlements, liabilities |
$ (148.6)
|
$ (38.1)
|
$ (286.3)
|
$ (53.9)
|
Ending balance, liabilities |
(863.7)
|
(230.0)
|
(863.7)
|
(230.0)
|
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities |
(7.8)
|
(49.5)
|
0.3
|
(59.5)
|
Gross purchases, sales, issuances and settlements |
|
|
|
|
Issuances, liabilities |
(160.1)
|
(56.3)
|
(314.0)
|
(90.1)
|
Settlements, liabilities |
11.5
|
18.2
|
27.7
|
36.2
|
Net purchases, sales, issuances and settlements, liabilities |
(148.6)
|
(38.1)
|
(286.3)
|
(53.9)
|
Funds withheld payable embedded derivative |
|
|
|
|
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
Beginning balance, liabilities |
2,804.8
|
2,764.1
|
3,014.5
|
2,567.1
|
Total realized/unrealized gains (losses) included in net income, liabilities |
$ 20.4
|
$ 232.9
|
$ (189.3)
|
$ 429.9
|
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Ending balance, liabilities |
$ 2,825.2
|
$ 2,997.0
|
$ 2,825.2
|
$ 2,997.0
|
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities |
20.4
|
232.9
|
(189.4)
|
429.9
|
Fixed maturities | Available-for-sale |
|
|
|
|
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
Beginning balance, assets |
3,950.2
|
3,539.5
|
3,898.2
|
3,636.8
|
Total realized/unrealized gains (losses) included in net income, assets |
$ 13.0
|
$ (1.6)
|
$ 16.0
|
$ (6.8)
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Total realized/unrealized gains (losses) included in other comprehensive income, assets |
$ 4.3
|
$ (24.2)
|
$ 4.4
|
$ (45.7)
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Net purchases, sales, issuances and settlements, assets |
$ 238.8
|
$ 166.8
|
$ 312.5
|
$ 88.3
|
Transfers into Level 3, assets |
121.5
|
90.5
|
121.5
|
210.0
|
Transfers out of Level 3, assets |
|
|
(24.8)
|
(111.6)
|
Ending balance, assets |
4,327.8
|
3,771.0
|
4,327.8
|
3,771.0
|
Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
13.0
|
(1.6)
|
27.4
|
(6.6)
|
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
4.6
|
(23.2)
|
3.9
|
(48.7)
|
Gross purchases, sales, issuances and settlements |
|
|
|
|
Purchases, assets |
377.9
|
304.9
|
837.8
|
571.4
|
Sales, assets |
(25.6)
|
(18.3)
|
(333.3)
|
(298.5)
|
Settlements, assets |
(113.5)
|
(119.8)
|
(192.0)
|
(184.6)
|
Net purchases, sales, issuances and settlements, assets |
238.8
|
166.8
|
312.5
|
88.3
|
States and political subdivisions | Available-for-sale |
|
|
|
|
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
Beginning balance, assets |
68.6
|
68.2
|
66.8
|
69.9
|
Total realized/unrealized gains (losses) included in other comprehensive income, assets |
$ (0.4)
|
$ (0.7)
|
$ 1.9
|
$ (2.0)
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Net purchases, sales, issuances and settlements, assets |
$ (0.4)
|
$ 2.0
|
$ (0.9)
|
$ 1.6
|
Transfers into Level 3, assets |
|
15.5
|
|
15.5
|
Ending balance, assets |
67.8
|
85.0
|
67.8
|
85.0
|
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
(0.4)
|
(0.7)
|
1.9
|
(2.0)
|
Gross purchases, sales, issuances and settlements |
|
|
|
|
Purchases, assets |
|
2.5
|
|
2.5
|
Settlements, assets |
(0.4)
|
(0.5)
|
(0.9)
|
(0.9)
|
Net purchases, sales, issuances and settlements, assets |
(0.4)
|
2.0
|
(0.9)
|
1.6
|
Corporate debt securities | Available-for-sale |
|
|
|
|
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
Beginning balance, assets |
2,419.3
|
2,202.6
|
2,350.4
|
2,305.9
|
Total realized/unrealized gains (losses) included in net income, assets |
$ 13.0
|
$ (1.6)
|
$ 15.9
|
$ (6.8)
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Total realized/unrealized gains (losses) included in other comprehensive income, assets |
$ (2.7)
|
$ (17.7)
|
$ (7.9)
|
$ (28.9)
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Net purchases, sales, issuances and settlements, assets |
$ 14.4
|
$ 25.9
|
$ 85.6
|
$ (100.5)
|
Transfers into Level 3, assets |
|
19.4
|
|
58.9
|
Ending balance, assets |
2,444.0
|
2,228.6
|
2,444.0
|
2,228.6
|
Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
13.0
|
(1.6)
|
27.4
|
(6.6)
|
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
(2.4)
|
(17.5)
|
(8.7)
|
(30.3)
|
Gross purchases, sales, issuances and settlements |
|
|
|
|
Purchases, assets |
89.0
|
141.9
|
324.2
|
277.4
|
Sales, assets |
(25.6)
|
(18.3)
|
(155.6)
|
(239.4)
|
Settlements, assets |
(49.0)
|
(97.7)
|
(83.0)
|
(138.5)
|
Net purchases, sales, issuances and settlements, assets |
14.4
|
25.9
|
85.6
|
(100.5)
|
Commercial mortgage-backed securities | Available-for-sale |
|
|
|
|
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
Beginning balance, assets |
2.6
|
2.9
|
2.7
|
3.0
|
Total realized/unrealized gains (losses) included in other comprehensive income, assets |
|
|
$ 0.1
|
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |
|
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
|
Net purchases, sales, issuances and settlements, assets |
|
(0.1)
|
$ (0.2)
|
(0.2)
|
Ending balance, assets |
2.6
|
2.8
|
2.6
|
2.8
|
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
|
|
0.1
|
|
Gross purchases, sales, issuances and settlements |
|
|
|
|
Settlements, assets |
|
(0.1)
|
(0.2)
|
(0.2)
|
Net purchases, sales, issuances and settlements, assets |
|
(0.1)
|
(0.2)
|
(0.2)
|
Collateralized debt obligations | Available-for-sale |
|
|
|
|
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
Beginning balance, assets |
|
99.4
|
|
75.4
|
Total realized/unrealized gains (losses) included in other comprehensive income, assets |
|
$ (1.1)
|
|
$ (2.8)
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Net purchases, sales, issuances and settlements, assets |
|
$ 6.4
|
|
$ 32.1
|
Ending balance, assets |
|
104.7
|
|
104.7
|
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
|
(0.3)
|
|
(3.7)
|
Gross purchases, sales, issuances and settlements |
|
|
|
|
Purchases, assets |
|
6.4
|
|
32.1
|
Net purchases, sales, issuances and settlements, assets |
|
6.4
|
|
32.1
|
Other debt obligations | Available-for-sale |
|
|
|
|
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
Beginning balance, assets |
1,459.7
|
1,166.4
|
1,478.3
|
1,182.6
|
Total realized/unrealized gains (losses) included in net income, assets |
|
|
$ 0.1
|
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
|
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
|
Total realized/unrealized gains (losses) included in other comprehensive income, assets |
$ 7.4
|
$ (4.7)
|
$ 10.3
|
$ (12.0)
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
|
Net purchases, sales, issuances and settlements, assets |
$ 224.8
|
$ 132.6
|
$ 228.0
|
$ 155.3
|
Transfers into Level 3, assets |
121.5
|
55.6
|
121.5
|
135.6
|
Transfers out of Level 3, assets |
|
|
(24.8)
|
(111.6)
|
Ending balance, assets |
1,813.4
|
1,349.9
|
1,813.4
|
1,349.9
|
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
7.4
|
(4.7)
|
10.6
|
(12.7)
|
Gross purchases, sales, issuances and settlements |
|
|
|
|
Purchases, assets |
288.9
|
154.1
|
513.6
|
259.4
|
Sales, assets |
|
|
(177.7)
|
(59.1)
|
Settlements, assets |
(64.1)
|
(21.5)
|
(107.9)
|
(45.0)
|
Net purchases, sales, issuances and settlements, assets |
224.8
|
132.6
|
228.0
|
155.3
|
Mortgage loans |
|
|
|
|
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
Beginning balance, assets |
|
|
140.6
|
|
Net purchases, sales, issuances and settlements, assets |
|
|
(140.6)
|
|
Gross purchases, sales, issuances and settlements |
|
|
|
|
Settlements, assets |
|
|
(140.6)
|
|
Net purchases, sales, issuances and settlements, assets |
|
|
(140.6)
|
|
Other investments |
|
|
|
|
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
Beginning balance, assets |
118.6
|
165.8
|
131.2
|
165.1
|
Total realized/unrealized gains (losses) included in net income, assets |
$ (2.9)
|
$ (6.1)
|
$ (0.2)
|
$ (11.4)
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Net purchases, sales, issuances and settlements, assets |
$ 3.6
|
$ 13.8
|
$ (11.7)
|
$ 19.8
|
Ending balance, assets |
119.3
|
173.5
|
119.3
|
173.5
|
Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
4.2
|
(3.2)
|
4.2
|
(6.6)
|
Gross purchases, sales, issuances and settlements |
|
|
|
|
Purchases, assets |
39.6
|
66.8
|
60.9
|
118.7
|
Sales, assets |
|
|
(1.5)
|
|
Settlements, assets |
(36.0)
|
(53.0)
|
(71.1)
|
(98.9)
|
Net purchases, sales, issuances and settlements, assets |
3.6
|
13.8
|
(11.7)
|
19.8
|
Fixed maturities, trading |
|
|
|
|
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
Beginning balance, assets |
571.1
|
470.2
|
562.6
|
415.8
|
Total realized/unrealized gains (losses) included in net income, assets |
$ (11.2)
|
$ 1.8
|
$ (11.9)
|
$ (1.7)
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Net purchases, sales, issuances and settlements, assets |
$ (68.0)
|
$ (26.8)
|
$ (54.0)
|
$ 31.1
|
Transfers out of Level 3, assets |
|
|
(4.8)
|
|
Ending balance, assets |
491.9
|
445.2
|
491.9
|
445.2
|
Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
(11.0)
|
2.2
|
(11.2)
|
2.1
|
Gross purchases, sales, issuances and settlements |
|
|
|
|
Purchases, assets |
98.3
|
33.8
|
162.6
|
221.1
|
Sales, assets |
(76.8)
|
(23.5)
|
(121.6)
|
(120.5)
|
Settlements, assets |
(89.5)
|
(37.1)
|
(95.0)
|
(69.5)
|
Net purchases, sales, issuances and settlements, assets |
(68.0)
|
(26.8)
|
(54.0)
|
31.1
|
Separate account assets |
|
|
|
|
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
Beginning balance, assets |
738.2
|
725.6
|
726.7
|
752.8
|
Total realized/unrealized gains (losses) included in net income, assets |
$ 3.2
|
$ (6.3)
|
$ 14.7
|
$ (32.6)
|
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
Net purchases, sales, issuances and settlements, assets |
|
$ (0.9)
|
|
$ (1.8)
|
Ending balance, assets |
$ 741.4
|
718.4
|
$ 741.4
|
718.4
|
Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
$ (1.2)
|
(31.5)
|
$ (7.8)
|
(19.1)
|
Gross purchases, sales, issuances and settlements |
|
|
|
|
Sales, assets |
|
|
|
(30.3)
|
Issuances, assets |
|
(0.9)
|
|
(10.5)
|
Settlements, assets |
|
|
|
39.0
|
Net purchases, sales, issuances and settlements, assets |
|
$ (0.9)
|
|
$ (1.8)
|