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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]      
Net income $ 662.5 $ 426.0 $ 35.3
Changes in net unrealized gains on investment securities:      
Having no credit losses recognized in the Consolidated Statements of Income 286.4 56.8 175.0
Having credit losses recognized in the Consolidated Statements of Income 0.8 2.5 3.6
Total available-for-sale securities 287.2 59.3 178.6
Pension and postretirement benefits:      
Net actuarial gains (losses) arising in the period (4.4) (5.8) 3.1
Net amount recognized as net periodic benefit cost 5.3 5.4 6.2
Total pension and postretirement benefits 0.9 (0.4) 9.3
Long-duration insurance contracts:      
Net change in market risk (3.2) 2.0 (3.6)
Total other comprehensive income, net of tax 284.9 60.9 184.3
Comprehensive income $ 947.4 $ 486.9 $ 219.6