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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 34.0 $ 118.9 $ 255.2 $ 194.1
Changes in net unrealized gains (losses) on investment securities:        
Having no credit losses recognized in the Consolidated Statements of Income (47.8) 27.5 (171.4) 198.4
Having credit losses recognized in the Consolidated Statements of Income (0.1) 0.3 0.1 (2.1)
Total available-for-sale securities (47.9) 27.8 (171.3) 196.3
Pension and postretirement benefits:        
Net change in net actuarial loss 0.6 1.1 2.0 3.5
Total other comprehensive income (loss), net of tax (47.3) 28.9 (169.3) 199.8
Comprehensive income (loss) $ (13.3) $ 147.8 $ 85.9 $ 393.9