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Fair Value - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Fair Value Measurements [Line Items]          
Investments, Fair Value $ 51,929.5 $ 50,942.8 $ 51,929.5 $ 50,942.8 $ 51,514.1
Goodwill impairment [1] $ 224.8 $ 0.0 $ 224.8 $ 0.0  
Fair Value, Inputs, Level 1          
Fair Value Measurements [Line Items]          
Vendor Quoted Prices, Percent of FV Hierarchy Level 87.00% 81.00% 87.00% 81.00% 79.00%
Investments, Fair Value $ 26,083.5 $ 25,754.0 $ 26,083.5 $ 25,754.0 $ 24,548.2
Fair Value, Inputs, Level 2          
Fair Value Measurements [Line Items]          
Vendor Quoted Prices, Percent of FV Hierarchy Level 98.00% 99.00% 98.00% 99.00% 98.00%
Dealer Quoted Prices, Percent of FV Hierarchy Level 2.00% 1.00% 2.00% 1.00% 2.00%
Investments, Fair Value $ 25,745.6 $ 25,013.9 $ 25,745.6 $ 25,013.9 $ 26,838.2
Fair Value, Inputs, Level 3          
Fair Value Measurements [Line Items]          
Investments, Fair Value 100.4 174.9 100.4 174.9 127.7
Available-for-sale Securities          
Fair Value Measurements [Line Items]          
Investments, Fair Value 47,784.3 44,741.6 47,784.3 44,741.6 44,815.7
Available-for-sale Securities | Total fixed maturities          
Fair Value Measurements [Line Items]          
Investments, Fair Value 43,172.5 43,031.0 43,172.5 43,031.0 43,873.1
Available-for-sale Securities | Fair Value, Inputs, Level 1          
Fair Value Measurements [Line Items]          
Investments, Fair Value 23,278.9 21,128.3 23,278.9 21,128.3 19,441.3
Available-for-sale Securities | Fair Value, Inputs, Level 1 | Total fixed maturities          
Fair Value Measurements [Line Items]          
Investments, Fair Value 18,729.1 19,448.5 18,729.1 19,448.5 18,498.9
Available-for-sale Securities | Fair Value, Inputs, Level 2          
Fair Value Measurements [Line Items]          
Investments, Fair Value 24,505.4 23,613.3 24,505.4 23,613.3 25,374.4
Available-for-sale Securities | Fair Value, Inputs, Level 2 | Total fixed maturities          
Fair Value Measurements [Line Items]          
Investments, Fair Value 24,443.4 23,582.5 24,443.4 23,582.5 25,374.2
Available-for-sale Securities | Fair Value, Inputs, Level 3          
Fair Value Measurements [Line Items]          
Investments, Fair Value 0.0 0.0 0.0 0.0 0.0
Available-for-sale Securities | Fair Value, Inputs, Level 3 | Total fixed maturities          
Fair Value Measurements [Line Items]          
Investments, Fair Value $ 0.0 $ 0.0 $ 0.0 $ 0.0 $ 0.0
[1] See Note 12 – Goodwill and Intangible Assets for further discussion.