XML 65 R44.htm IDEA: XBRL DOCUMENT v3.22.0.1
SCHEDULE I - Summary Of Investments - Other Than Investments in Related Parties Summary Of Investments - Other than Investments In Related Parties (Detail)
$ in Millions
Dec. 31, 2021
USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost $ 47,572.7
Fair Value 51,514.1
Amount At Which Shown In The Balance Sheet 51,514.1
Fixed maturities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 43,794.2
Fair Value 43,873.1
Amount At Which Shown In The Balance Sheet 43,873.1
Fixed maturities | US Government Agencies and Authorities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 18,586.1
Fair Value 18,488.2
Amount At Which Shown In The Balance Sheet 18,488.2
Fixed maturities | State and local government obligations  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 2,162.6
Fair Value 2,185.3
Amount At Which Shown In The Balance Sheet 2,185.3
Fixed maturities | Foreign government obligations  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 17.9
Fair Value 17.9
Amount At Which Shown In The Balance Sheet 17.9
Fixed maturities | Public Utilities, Bonds  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 764.6
Fair Value 777.7
Amount At Which Shown In The Balance Sheet 777.7
Fixed maturities | Corporate And Other Debt Securities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 9,761.6
Fair Value 9,914.4
Amount At Which Shown In The Balance Sheet 9,914.4
Fixed maturities | Asset-backed Securities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 12,330.5
Fair Value 12,307.9
Amount At Which Shown In The Balance Sheet 12,307.9
Fixed maturities | Redeemable preferred stocks  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 170.9
Fair Value 181.7
Amount At Which Shown In The Balance Sheet 181.7
Equity securities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 2,835.9
Fair Value 6,698.4
Amount At Which Shown In The Balance Sheet 6,698.4
Equity securities | Utilities  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 69.2
Fair Value 178.8
Amount At Which Shown In The Balance Sheet 178.8
Equity securities | Financials  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 251.1
Fair Value 902.2
Amount At Which Shown In The Balance Sheet 902.2
Equity securities | Industrials  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 943.8
Fair Value 3,977.5
Amount At Which Shown In The Balance Sheet 3,977.5
Equity securities | Nonredeemable preferred stocks  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 1,571.8
Fair Value 1,639.9
Amount At Which Shown In The Balance Sheet 1,639.9
Short-term investments  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Cost 942.6
Fair Value 942.6
Amount At Which Shown In The Balance Sheet $ 942.6