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Schedule II - Condensed Statements of Comprehensive Income Parent Company (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Condensed Statement Of Income Captions [Line Items]      
Net income $ 215.5 $ 265.3 $ 1,249.1
Other comprehensive income (loss), net of tax:      
Unrealized gains (losses) on securities 198.0 (780.9) (142.1)
Unrealized losses on debt securities for which credit-related portion was recognized in earnings 0.0 0.0 0.4
Foreign currency translation adjustment 17.2 (42.2) (1.9)
Pension benefit adjustment (2.1) 46.6 12.4
Total other comprehensive income (loss), net of tax 213.1 (776.5) (132.0)
Comprehensive income (loss) 428.6 (511.2) 1,117.1
Less: Comprehensive (loss) income attributable to noncontrolling interests (1.3) 2.3 8.0
Comprehensive income (loss) attributable to the Company 429.9 (513.5) 1,109.1
Parent Company      
Condensed Statement Of Income Captions [Line Items]      
Net income 215.5 265.3 1,249.1
Other comprehensive income (loss), net of tax:      
Unrealized gains (losses) on securities 198.0 (780.9) (142.1)
Unrealized losses on debt securities for which credit-related portion was recognized in earnings 0.0 0.0 (0.4)
Foreign currency translation adjustment 17.2 (42.2) (1.9)
Pension benefit adjustment (2.1) 46.6 12.4
Total other comprehensive income (loss), net of tax 213.1 (776.5) (132.0)
Comprehensive income (loss) 428.6 (511.2) 1,117.1
Less: Comprehensive (loss) income attributable to noncontrolling interests (1.3) 2.3 8.0
Comprehensive income (loss) attributable to the Company $ 429.9 $ (513.5) $ 1,109.1