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Investments Components of Net Realized Gains (Losses) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales $ 67.3 $ 2.2 $ 192.7 $ 19.9
Equity Securities, FV-NI, Gross Realized Gains on Sales 8.3 126.9 29.6 268.9
Debt and Equity Securities, Gross Realized Gains on Sales 75.6 129.1 222.3 288.8
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment (1.9) (11.5) (27.1) (63.6)
Equity Securities, FV-NI, Gross Realized Losses on Sales (2.0) (9.2) (9.9) (19.4)
Debt and Equity Securities, Gross Realized Losses on Sales (3.9) (20.7) (37.0) (83.0)
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 65.4 (9.3) 165.6 (43.7)
Equity Securities, FV-NI, Net Realized Gain (Loss) on Sales 6.3 117.7 19.7 249.5
Gross Realized Gain (Loss), excluding Holding Period and OTTI 71.7 108.4 185.3 205.8
Unrealized Gain (Loss) on Hybrid Instrument, Net 4.2 1.3 16.3 (4.2)
Net holding period gains (losses), equity securities 27.6 94.5 520.6 (1.7)
Net Holding Period Realized Gain (Loss) 31.8 95.8 536.9 (5.9)
Other than Temporary Impairment Losses, Portion Recognized in Earnings, Net of Sales (38.1) (22.1) (62.4) (33.2)
Total net realized gains (losses) on securities 65.4 182.1 659.8 166.7
U.S. government obligations        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 41.5 0.1 113.0 1.8
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment (1.5) (7.6) (13.9) (46.4)
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 40.0 (7.5) 99.1 (44.6)
State and local government obligations        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 1.8 0.2 4.0 9.4
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment 0.0 (0.6) (0.7) (2.5)
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 1.8 (0.4) 3.3 6.9
Corporate debt securities        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 21.3 1.7 68.5 2.1
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment (0.2) (3.2) (7.7) (7.3)
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 21.1 (1.5) 60.8 (5.2)
Residential mortgage-backed securities        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 0.0 0.0 0.2 0.0
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment 0.0 0.0 (2.3) 0.0
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 0.0 0.0 (2.1) 0.0
Commercial mortgage-backed securities        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 2.6 0.0 6.2 2.0
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment 0.0 0.0 (2.1) (6.3)
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 2.6 0.0 4.1 (4.3)
Other asset-backed securities        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 0.1 0.0 0.8 0.1
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment 0.0 (0.1) (0.1) (1.1)
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment 0.1 (0.1) 0.7 (1.0)
Redeemable preferred stocks        
Gain (Loss) on Securities [Line Items]        
Debt Securities, Available-for-Sale, Gross Realized Gains on Sales 0.0 0.2 0.0 4.5
Debt Securities, Available-for-Sale, Gross Realized Losses excluding Other-than-Temporary Impairment (0.2) 0.0 (0.3) 0.0
Debt Securities, Available-for-Sale, Realized Gain (Loss) on Sales, Excluding Other-than-Temporary Impairment (0.2) 0.2 (0.3) 4.5
Nonredeemable preferred stocks        
Gain (Loss) on Securities [Line Items]        
Equity Securities, FV-NI, Gross Realized Gains on Sales 3.6 0.1 20.2 3.7
Equity Securities, FV-NI, Gross Realized Losses on Sales (2.0) 0.0 (2.0) (2.3)
Equity Securities, FV-NI, Net Realized Gain (Loss) on Sales 1.6 0.1 18.2 1.4
Common equities        
Gain (Loss) on Securities [Line Items]        
Equity Securities, FV-NI, Gross Realized Gains on Sales 4.7 126.8 9.4 265.2
Equity Securities, FV-NI, Gross Realized Losses on Sales 0.0 (9.2) (7.9) (17.1)
Equity Securities, FV-NI, Net Realized Gain (Loss) on Sales 4.7 117.6 1.5 248.1
Other Assets        
Gain (Loss) on Securities [Line Items]        
Other than Temporary Impairment Losses, Portion Recognized in Earnings, Net of Sales $ (38.1) $ (22.1) $ (62.4) $ (33.2)