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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Statement Of Income And Comprehensive Income [Abstract]    
Net income $ 46.0 $ 98.1
Other comprehensive income (loss), net of tax:    
Unrealized gains (losses) on debt securities 110.1 (371.6)
Foreign currency translation adjustment 2.6 2.3
Pension benefit adjustment 0.3 1.1
Total other comprehensive income (loss), net of tax 113.0 (368.2)
Comprehensive income (loss) 159.0 (270.1)
Less: Comprehensive income attributable to noncontrolling interests 0.1 0.2
Comprehensive income (loss) attributable to the Company $ 158.9 $ (270.3)