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Investments Investment Portfolio by Major Security Type (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-Sale, at Fair Value    
Cost $ 34,441.9 $ 30,051.8
Gross Unrealized Gains 517.0 115.4
Gross Unrealized Losses (57.6) (249.6)
Net Holding Period Gains (Losses) 7.8 (10.2)
Fair Value $ 34,909.1 $ 29,907.4
% of Total Fair Value 88.90% 89.10%
Equity Securities, at Fair Value    
Cost $ 2,096.8 $ 2,151.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Net Holding Period Gains (Losses) 2,248.4 1,508.5
Fair Value $ 4,345.2 $ 3,660.0
% of Total Fair Value 11.10% 10.90%
Debt and Equity Securities, at Fair Value    
Cost $ 36,538.7 $ 32,203.3
Gross Unrealized Gains 517.0 115.4
Gross Unrealized Losses (57.6) (249.6)
Net Holding Period Gains (Losses) 2,256.2 1,498.3
Fair Value $ 39,254.3 $ 33,567.4
% of Total Fair Value 100.00% 100.00%
Other Payables to Broker-Dealers and Clearing Organizations $ 11.9 $ 5.9
Securities Held In Consolidated Non-Insurance Subsidiary 3,200.0 2,900.0
Nonredeemable preferred stocks    
Equity Securities, at Fair Value    
Cost 971.3 1,002.6
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Net Holding Period Gains (Losses) 67.6 31.3
Fair Value $ 1,038.9 $ 1,033.9
% of Total Fair Value 2.70% 3.10%
Common equities    
Equity Securities, at Fair Value    
Cost $ 1,125.5 $ 1,148.9
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Net Holding Period Gains (Losses) 2,180.8 1,477.2
Fair Value $ 3,306.3 $ 2,626.1
% of Total Fair Value 8.40% 7.80%
Fixed maturities    
Debt Securities, Available-for-Sale, at Fair Value    
Cost $ 32,643.1 $ 28,255.9
Gross Unrealized Gains 517.0 115.4
Gross Unrealized Losses (57.6) (249.6)
Net Holding Period Gains (Losses) 7.8 (10.2)
Fair Value $ 33,110.3 $ 28,111.5
% of Total Fair Value 84.30% 83.70%
Fixed maturities | U.S. government obligations    
Debt Securities, Available-for-Sale, at Fair Value    
Cost $ 13,100.7 $ 9,897.4
Gross Unrealized Gains 194.1 71.2
Gross Unrealized Losses (43.7) (52.1)
Net Holding Period Gains (Losses) 0.0 0.0
Fair Value $ 13,251.1 $ 9,916.5
% of Total Fair Value 33.70% 29.50%
Fixed maturities | State and local government obligations    
Debt Securities, Available-for-Sale, at Fair Value    
Cost $ 1,686.0 $ 1,654.6
Gross Unrealized Gains 30.0 7.3
Gross Unrealized Losses (2.7) (12.8)
Net Holding Period Gains (Losses) 0.0 0.0
Fair Value $ 1,713.3 $ 1,649.1
% of Total Fair Value 4.40% 4.90%
Fixed maturities | Corporate debt securities    
Debt Securities, Available-for-Sale, at Fair Value    
Cost $ 6,860.3 $ 8,808.5
Gross Unrealized Gains 206.6 13.6
Gross Unrealized Losses (0.5) (125.3)
Net Holding Period Gains (Losses) 1.3 (2.5)
Fair Value $ 7,067.7 $ 8,694.3
% of Total Fair Value 18.00% 25.90%
Fixed maturities | Residential mortgage-backed securities    
Debt Securities, Available-for-Sale, at Fair Value    
Cost $ 625.0 $ 733.5
Gross Unrealized Gains 4.5 6.0
Gross Unrealized Losses (2.0) (5.1)
Net Holding Period Gains (Losses) 0.0 0.0
Fair Value $ 627.5 $ 734.4
% of Total Fair Value 1.60% 2.20%
Fixed maturities | Commercial mortgage-backed securities    
Debt Securities, Available-for-Sale, at Fair Value    
Cost $ 5,020.7 $ 3,332.8
Gross Unrealized Gains 61.5 7.8
Gross Unrealized Losses (6.0) (39.0)
Net Holding Period Gains (Losses) 0.0 0.0
Fair Value $ 5,076.2 $ 3,301.6
% of Total Fair Value 12.90% 9.80%
Fixed maturities | Other asset-backed securities    
Debt Securities, Available-for-Sale, at Fair Value    
Cost $ 5,164.7 $ 3,585.4
Gross Unrealized Gains 16.2 3.6
Gross Unrealized Losses (1.4) (11.8)
Net Holding Period Gains (Losses) 0.0 0.1
Fair Value $ 5,179.5 $ 3,577.3
% of Total Fair Value 13.20% 10.70%
Fixed maturities | Redeemable preferred stocks    
Debt Securities, Available-for-Sale, at Fair Value    
Cost $ 185.7 $ 243.7
Gross Unrealized Gains 4.1 5.9
Gross Unrealized Losses (1.3) (3.5)
Net Holding Period Gains (Losses) 6.5 (7.8)
Fair Value $ 195.0 $ 238.3
% of Total Fair Value 0.50% 0.70%
Short-term investments    
Debt Securities, Available-for-Sale, at Fair Value    
Cost $ 1,798.8 $ 1,795.9
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Net Holding Period Gains (Losses) 0.0 0.0
Fair Value $ 1,798.8 $ 1,795.9
% of Total Fair Value 4.60% 5.40%