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Investments Components of Net Realized Gains (Losses) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales $ 76.8 $ 276.1 $ 224.8 $ 567.7
Equity Securities, FV-NI, Gross Realized Gains on Sales 351.4 9.2 369.8 94.8
Debt and Equity Securities, Gross Realized Gains on Sales 428.2 285.3 594.6 662.5
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment (13.8) (15.9) (36.4) (19.6)
Equity Securities, FV-NI, Gross Realized Losses on Sales (4.3) (9.4) (4.3) (67.7)
Debt and Equity Securities, Gross Realized Losses on Sales (18.1) (25.3) (40.7) (87.3)
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 63.0 260.2 188.4 548.1
Equity Securities, FV-NI, Net Realized Gain (Loss) on Sales 347.1 (0.2) 365.5 27.1
Gross Realized Gain (Loss), excluding Holding Period and OTTI 410.1 260.0 553.9 575.2
Unrealized Gain (Loss) on Hybrid Instrument, Net 9.9 24.8 (1.0) (6.4)
Net holding period gains (losses), equity securities 44.3 606.0 496.7 (231.6)
Net Holding Period Realized Gain (Loss) 54.2 630.8 495.7 (238.0)
Net impairment losses recognized in earnings (2.5) 0.0 (2.5) 0.0
Total net realized gains (losses) on securities 461.8 890.8 1,047.1 337.2
Other Assets        
Gain (Loss) on Securities [Line Items]        
Net impairment losses recognized in earnings (2.5) 0.0 (2.5) 0.0
U.S. government obligations        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 11.3 224.5 77.9 475.6
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment (6.9) (0.6) (26.5) (3.3)
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 4.4 223.9 51.4 472.3
State and local government obligations        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 14.1 13.0 44.3 15.0
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment (2.8) 0.0 (3.0) 0.0
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 11.3 13.0 41.3 15.0
Corporate debt securities        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 40.1 34.3 60.8 66.7
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment (3.3) (5.5) (5.4) (6.5)
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 36.8 28.8 55.4 60.2
Residential mortgage-backed securities        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 0.3 0.0 0.3 0.0
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 0.3 0.0 0.3 0.0
Commercial mortgage-backed securities        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 9.5 4.3 39.3 10.4
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment (0.5) (9.8) (1.1) (9.8)
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 9.0 (5.5) 38.2 0.6
Other asset-backed securities        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 0.0 0.0 0.7 0.0
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment (0.3) 0.0 (0.4) 0.0
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment (0.3) 0.0 0.3 0.0
Redeemable preferred stocks        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 1.5 0.0 1.5 0.0
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 1.5 0.0 1.5 0.0
Nonredeemable preferred stocks        
Gain (Loss) on Securities [Line Items]        
Equity Securities, FV-NI, Gross Realized Gains on Sales 6.4 0.1 23.7 19.7
Equity Securities, FV-NI, Gross Realized Losses on Sales (0.4) (3.0) (0.4) (7.4)
Equity Securities, FV-NI, Net Realized Gain (Loss) on Sales 6.0 (2.9) 23.3 12.3
Common equities        
Gain (Loss) on Securities [Line Items]        
Equity Securities, FV-NI, Gross Realized Gains on Sales 345.0 9.1 346.1 75.1
Equity Securities, FV-NI, Gross Realized Losses on Sales (3.9) (6.4) (3.9) (60.3)
Equity Securities, FV-NI, Net Realized Gain (Loss) on Sales $ 341.1 $ 2.7 $ 342.2 $ 14.8