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, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
| Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
| Beginning balance, net derivative assets (liabilities) |
$ (1.7)
|
$ (1.8)
|
$ 17.9
|
$ 13.5
|
| Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) |
$ 24.2
|
$ (11.1)
|
$ 4.2
|
$ (27.8)
|
| 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) |
$ 0.8
|
$ (0.1)
|
$ 1.2
|
$ 1.2
|
| Transfers out of Level 3, net derivative assets (liabilities) |
|
(0.1)
|
|
|
| Ending balance, net derivative assets (liabilities) |
23.3
|
(13.1)
|
23.3
|
(13.1)
|
| Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) |
10.3
|
(12.6)
|
1.6
|
(30.6)
|
| Gross purchases, sales, issuances and settlements |
|
|
|
|
| Purchases, net derivative assets (liabilities) |
0.1
|
0.2
|
0.3
|
0.9
|
| Sales, net derivative assets (liabilities) |
0.7
|
(0.3)
|
0.9
|
0.3
|
| Net purchases, sales, issuances and settlements, net derivative assets (liabilities) |
0.8
|
(0.1)
|
1.2
|
1.2
|
| Investment and universal life contracts |
|
|
|
|
| Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
| Beginning balance, liabilities |
(1,357.7)
|
(522.7)
|
(1,410.2)
|
(578.4)
|
| Total realized/unrealized gains (losses) included in net income, liabilities |
$ (668.0)
|
$ (192.4)
|
$ (522.9)
|
$ 1.0
|
| 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 |
$ (116.8)
|
$ (148.6)
|
$ (209.4)
|
$ (286.3)
|
| Ending balance, liabilities |
(2,142.5)
|
(863.7)
|
(2,142.5)
|
(863.7)
|
| Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities |
(526.8)
|
(7.8)
|
(521.7)
|
0.3
|
| Gross purchases, sales, issuances and settlements |
|
|
|
|
| Issuances, liabilities |
(131.4)
|
(160.1)
|
(241.2)
|
(314.0)
|
| Settlements, liabilities |
14.6
|
11.5
|
31.8
|
27.7
|
| Net purchases, sales, issuances and settlements, liabilities |
(116.8)
|
(148.6)
|
(209.4)
|
(286.3)
|
| Funds withheld payable embedded derivative |
|
|
|
|
| Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
| Beginning balance, liabilities |
2,810.8
|
2,804.8
|
2,633.4
|
3,014.5
|
| Total realized/unrealized gains (losses) included in net income, liabilities |
$ (104.4)
|
$ 20.4
|
$ 73.0
|
$ (189.3)
|
| 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 |
$ 2,706.4
|
$ 2,825.2
|
$ 2,706.4
|
$ 2,825.2
|
| Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities |
(104.4)
|
20.4
|
73.0
|
(189.4)
|
| Fixed maturities | Available-for-sale |
|
|
|
|
| Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
| Beginning balance, assets |
4,392.3
|
3,950.2
|
4,304.2
|
3,898.2
|
| Total realized/unrealized gains (losses) included in net income, assets |
$ (1.8)
|
$ 13.0
|
$ (34.1)
|
$ 16.0
|
| 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 |
$ 10.5
|
$ 4.3
|
$ 6.1
|
$ 4.4
|
| 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 |
$ (269.9)
|
$ 238.8
|
$ (192.9)
|
$ 312.5
|
| Transfers into Level 3, assets |
32.6
|
121.5
|
85.2
|
121.5
|
| Transfers out of Level 3, assets |
(112.9)
|
|
(117.7)
|
(24.8)
|
| Ending balance, assets |
4,050.8
|
4,327.8
|
4,050.8
|
4,327.8
|
| Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
(5.6)
|
13.0
|
(18.0)
|
27.4
|
| Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
13.8
|
4.6
|
3.1
|
3.9
|
| Gross purchases, sales, issuances and settlements |
|
|
|
|
| Purchases, assets |
209.7
|
377.9
|
572.4
|
837.8
|
| Sales, assets |
(266.9)
|
(25.6)
|
(292.8)
|
(333.3)
|
| Settlements, assets |
(212.7)
|
(113.5)
|
(472.5)
|
(192.0)
|
| Net purchases, sales, issuances and settlements, assets |
(269.9)
|
238.8
|
(192.9)
|
312.5
|
| States and political subdivisions | Available-for-sale |
|
|
|
|
| Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
| Beginning balance, assets |
68.2
|
68.6
|
68.4
|
66.8
|
| Total realized/unrealized gains (losses) included in other comprehensive income, assets |
$ (0.5)
|
$ (0.4)
|
$ (0.2)
|
$ 1.9
|
| 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 |
$ (0.5)
|
$ (0.4)
|
$ (1.0)
|
$ (0.9)
|
| Transfers into Level 3, assets |
32.6
|
|
32.6
|
|
| Ending balance, assets |
99.8
|
67.8
|
99.8
|
67.8
|
| Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
(0.6)
|
(0.4)
|
(0.3)
|
1.9
|
| Gross purchases, sales, issuances and settlements |
|
|
|
|
| Settlements, assets |
(0.5)
|
(0.4)
|
(1.0)
|
(0.9)
|
| Net purchases, sales, issuances and settlements, assets |
(0.5)
|
(0.4)
|
(1.0)
|
(0.9)
|
| Corporate debt securities | Available-for-sale |
|
|
|
|
| Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
| Beginning balance, assets |
2,549.1
|
2,419.3
|
2,477.7
|
2,350.4
|
| Total realized/unrealized gains (losses) included in net income, assets |
$ (1.8)
|
$ 13.0
|
$ (32.0)
|
$ 15.9
|
| 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 |
$ 1.0
|
$ (2.7)
|
$ 6.3
|
$ (7.9)
|
| 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 |
$ (31.5)
|
$ 14.4
|
$ 64.8
|
$ 85.6
|
| Ending balance, assets |
2,516.8
|
2,444.0
|
2,516.8
|
2,444.0
|
| Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
(5.6)
|
13.0
|
(16.8)
|
27.4
|
| Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
4.5
|
(2.4)
|
2.5
|
(8.7)
|
| Gross purchases, sales, issuances and settlements |
|
|
|
|
| Purchases, assets |
124.8
|
89.0
|
378.3
|
324.2
|
| Sales, assets |
(44.9)
|
(25.6)
|
(70.8)
|
(155.6)
|
| Settlements, assets |
(111.4)
|
(49.0)
|
(242.7)
|
(83.0)
|
| Net purchases, sales, issuances and settlements, assets |
(31.5)
|
14.4
|
64.8
|
85.6
|
| Commercial mortgage-backed securities | Available-for-sale |
|
|
|
|
| Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
| Beginning balance, assets |
2.3
|
2.6
|
2.4
|
2.7
|
| Total realized/unrealized gains (losses) included in other comprehensive income, assets |
|
|
|
0.1
|
| Net purchases, sales, issuances and settlements, assets |
(0.1)
|
|
(0.2)
|
(0.2)
|
| Ending balance, assets |
2.2
|
2.6
|
2.2
|
2.6
|
| 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)
|
| Other debt obligations | Available-for-sale |
|
|
|
|
| Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
| Beginning balance, assets |
1,772.7
|
1,459.7
|
1,755.7
|
1,478.3
|
| Total realized/unrealized gains (losses) included in net income, assets |
|
|
$ (2.1)
|
$ 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
|
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
|
| Total realized/unrealized gains (losses) included in other comprehensive income, assets |
$ 10.0
|
$ 7.4
|
|
$ 10.3
|
| 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
|
| Net purchases, sales, issuances and settlements, assets |
$ (237.8)
|
$ 224.8
|
$ (256.5)
|
$ 228.0
|
| Transfers into Level 3, assets |
|
121.5
|
52.6
|
121.5
|
| Transfers out of Level 3, assets |
(112.9)
|
|
(117.7)
|
(24.8)
|
| Ending balance, assets |
1,432.0
|
1,813.4
|
1,432.0
|
1,813.4
|
| Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
|
|
(1.2)
|
|
| Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
9.9
|
7.4
|
0.9
|
10.6
|
| Gross purchases, sales, issuances and settlements |
|
|
|
|
| Purchases, assets |
84.9
|
288.9
|
194.1
|
513.6
|
| Sales, assets |
(222.0)
|
|
(222.0)
|
(177.7)
|
| Settlements, assets |
(100.7)
|
(64.1)
|
(228.6)
|
(107.9)
|
| Net purchases, sales, issuances and settlements, assets |
(237.8)
|
224.8
|
(256.5)
|
228.0
|
| Fixed maturities, trading |
|
|
|
|
| Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
| Beginning balance, assets |
497.0
|
571.1
|
457.4
|
562.6
|
| Total realized/unrealized gains (losses) included in net income, assets |
$ (6.7)
|
$ (11.2)
|
$ (12.0)
|
$ (11.9)
|
| 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 |
$ (85.8)
|
$ (68.0)
|
$ (40.9)
|
$ (54.0)
|
| Transfers out of Level 3, assets |
|
|
|
(4.8)
|
| Ending balance, assets |
404.5
|
491.9
|
404.5
|
491.9
|
| Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
(5.5)
|
(11.0)
|
(9.8)
|
(11.2)
|
| Gross purchases, sales, issuances and settlements |
|
|
|
|
| Purchases, assets |
56.2
|
98.3
|
142.2
|
162.6
|
| Sales, assets |
(133.5)
|
(76.8)
|
(170.6)
|
(121.6)
|
| Settlements, assets |
(8.5)
|
(89.5)
|
(12.5)
|
(95.0)
|
| Net purchases, sales, issuances and settlements, assets |
(85.8)
|
(68.0)
|
(40.9)
|
(54.0)
|
| 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 |
125.3
|
118.6
|
167.2
|
131.2
|
| Total realized/unrealized gains (losses) included in net income, assets |
$ (3.3)
|
$ (2.9)
|
$ (7.1)
|
$ (0.2)
|
| 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 |
$ (33.8)
|
$ 3.6
|
$ (71.9)
|
$ (11.7)
|
| Ending balance, assets |
88.2
|
119.3
|
88.2
|
119.3
|
| Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
1.0
|
4.2
|
0.4
|
4.2
|
| Gross purchases, sales, issuances and settlements |
|
|
|
|
| Purchases, assets |
(1.5)
|
39.6
|
8.8
|
60.9
|
| Sales, assets |
(0.7)
|
|
(0.7)
|
(1.5)
|
| Settlements, assets |
(31.6)
|
(36.0)
|
(80.0)
|
(71.1)
|
| Net purchases, sales, issuances and settlements, assets |
(33.8)
|
3.6
|
(71.9)
|
(11.7)
|
| Separate account assets |
|
|
|
|
| Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
|
|
|
| Beginning balance, assets |
760.6
|
738.2
|
742.5
|
726.7
|
| Total realized/unrealized gains (losses) included in net income, assets |
$ (0.2)
|
$ 3.2
|
$ 17.9
|
$ 14.7
|
| 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
|
| Ending balance, assets |
$ 760.4
|
$ 741.4
|
$ 760.4
|
$ 741.4
|
| Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
$ (0.9)
|
$ (1.2)
|
$ 17.2
|
$ (7.8)
|