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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 102.1 $ 8.6 $ 258.1 $ (72.6)
Changes in net unrealized gains (losses) on investment securities:        
Having no credit losses recognized in the Consolidated Statements of Income (Loss) 242.4 (113.7) 212.3 (87.0)
Having credit losses recognized in the Consolidated Statements of Income (Loss) 0.6 (0.5) 2.6 0.9
Total available-for-sale securities 243.0 (114.2) 214.9 (86.1)
Pension and postretirement benefits:        
Net change in net actuarial loss 1.4 1.5 4.1 4.7
Long-duration insurance contracts:        
Net change in market risk (3.1) 3.3 (1.3) 2.6
Total other comprehensive income (loss), net of tax 241.3 (109.4) 217.7 (78.8)
Comprehensive income (loss) $ 343.4 $ (100.8) $ 475.8 $ (151.4)