v3.26.1
Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2026
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Components of Accumulated Other Comprehensive Income, Net of Tax The following tables summarize those reclassification adjustments (net of taxes) for the periods indicated: 
Three Months Ended June 30, 2026
Foreign currency translation adjustment
Net unrealized losses on investments
Net unrealized gains on derivative transactions
Unamortized net losses on Pension Plans
Accumulated other comprehensive loss
Balance at March 31, 2026
$
(346.0)
$
(152.6)
$
0.9 
$
(131.3)
$
(629.0)
Change in accumulated other comprehensive income (loss) before reclassifications
8.5 
13.9 
(2.6)
0.3 
20.1 
Amounts reclassified from accumulated other comprehensive income (loss)
— 
8.8 
(0.5)
0.6 
8.9 
Net current-period other comprehensive income (loss)
8.5 
22.7 
(3.1)
0.9 
29.0 
Balance at June 30, 2026
$
(337.5)
$
(129.9)
$
(2.2)
$
(130.4)
$
(600.0)
Three Months Ended June 30, 2025
Foreign currency translation adjustment
Net unrealized losses on investments
Net unrealized gains on derivative transactions
Unamortized net losses on Pension Plans
Accumulated other comprehensive loss
Balance at March 31, 2025
$
(406.4)
$
(216.7)
$
3.6 
$
(129.0)
$
(748.5)
Change in accumulated other comprehensive income (loss) before reclassifications
43.9 
52.5 
0.8 
— 
97.2 
Amounts reclassified from accumulated other comprehensive income (loss)
— 
16.7 
(0.2)
0.2 
16.7 
Net current-period other comprehensive income (loss)
43.9 
69.2 
0.6 
0.2 
113.9 
Balance at June 30, 2025
$
(362.5)
$
(147.5)
$
4.2 
$
(128.8)
$
(634.6)
Six Months Ended June 30, 2026
Foreign currency translation adjustment
Net unrealized gains (losses) on investments
Net unrealized gains on derivative transactions
Unamortized net losses on Pension Plans
Accumulated other comprehensive loss
Balance at December 31, 2025
$
(351.5)
$
(63.0)
$
1.8 
$
(131.5)
$
(544.2)
Change in accumulated other comprehensive income (loss) before reclassifications
14.0 
(87.8)
(3.1)
(0.1)
(77.0)
Amounts reclassified from accumulated other comprehensive income (loss)
— 
20.9 
(0.9)
1.2 
21.2 
Net current-period other comprehensive income (loss)
14.0 
(66.9)
(4.0)
1.1 
(55.8)
Balance at June 30, 2026
$
(337.5)
$
(129.9)
$
(2.2)
$
(130.4)
$
(600.0)
Six Months Ended June 30, 2025
Foreign currency translation adjustment
Net unrealized gains on investments
Net unrealized gains on derivative transactions
Unamortized net losses on Pension Plans
Accumulated other comprehensive loss
Balance at December 31, 2024
$
(415.2)
$
(291.9)
$
2.2 
$
(131.2)
$
(836.1)
Change in accumulated other comprehensive income (loss) before reclassifications
52.7 
114.3 
2.5 
— 
169.5 
Amounts reclassified from accumulated other comprehensive income (loss)
— 
30.1 
(0.5)
2.4 
32.0 
Net current-period other comprehensive income (loss)
52.7 
144.4 
2.0 
2.4 
201.5 
Balance at June 30, 2025
$
(362.5)
$
(147.5)
$
4.2 
$
(128.8)
$
(634.6)
Schedule of Reclassification out of Accumulated Other Comprehensive Income
The following tables summarize the reclassifications out of AOCI for the periods indicated:
Details about accumulated other comprehensive income components
Amount reclassified from accumulated other comprehensive income
Affected line item in the statement where net income is presented
Three Months Ended June 30,
Six Months Ended June 30,
2026
2025
2026
2025
Net unrealized losses on investments
$
11.1 
$
21.1 
$
26.4 
$
38.1 
Net realized losses on investments and fair value changes to equity securities
(2.3)
(4.4)
(5.5)
(8.0)
Provision for income taxes
$
8.8 
$
16.7 
$
20.9 
$
30.1 
Net of tax
Net unrealized (gains) losses on derivative transactions related to:
Interest rate derivatives
$
(0.6)
$
(0.7)
$
(1.1)
$
(1.4)
Interest expense
Foreign exchange derivatives
— 
0.5 
— 
0.8 
Underwriting, selling, general and administrative expenses
(0.6)
(0.2)
(1.1)
(0.6)
0.1 
— 
0.2 
0.1 
Provision for income taxes
$
(0.5)
$
(0.2)
$
(0.9)
$
(0.5)
Net of tax
Amortization of pension and postretirement unrecognized net periodic benefit cost:
Amortization of net loss
$
0.7 
$
0.3 
$
1.4 
$
0.6 
(1)
Settlement loss
— 
— 
— 
2.5 
(1)
0.7 
0.3 
1.4 
3.1 
(0.1)
(0.1)
(0.2)
(0.7)
Provision for income taxes
$
0.6 
$
0.2 
$
1.2 
$
2.4 
Net of tax
Total reclassifications for the period
$
8.9 
$
16.7 
$
21.2 
$
32.0 
Net of tax
(1)These AOCI components are included in the computation of net periodic pension cost. For additional information, see Note 13.