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Fair Value Measurements by Input Level (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Fixed Maturity Securities    
Fixed Maturity Securities $ 43,513.8 $ 44,137.3
Derivative Assets 23.4 19.8
Equity Securities 33.3 28.3
Other Long-term Investments 1,062.9 960.2
Assets, Fair Value Disclosure 44,428.7 44,932.9
Liabilities    
Derivative Liabilities 65.6 99.5
Liabilities, Fair Value Disclosure 65.6 99.5
Interest Rate Swaps    
Liabilities    
Derivative Liabilities 0.1 0.5
Foreign Exchange Contracts    
Liabilities    
Derivative Liabilities 44.2 59.2
Embedded Derivative in Modified Coinsurance Arrangement    
Liabilities    
Derivative Liabilities 21.2 39.8
Fair Value, Measurements, Recurring    
Fixed Maturity Securities    
Other Long-term Investments 914.9 795.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 11,012.7 4,221.3
Derivative Assets 0.0 0.0
Equity Securities 27.6 8.4
Other Long-term Investments 27.6 8.4
Assets, Fair Value Disclosure 11,040.3 4,229.7
Liabilities    
Liabilities, Fair Value Disclosure 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Interest Rate Swaps    
Liabilities    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Foreign Exchange Contracts    
Liabilities    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Embedded Derivative in Modified Coinsurance Arrangement    
Liabilities    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 31,959.2 38,668.6
Derivative Assets 23.4 19.8
Equity Securities 0.2 15.2
Other Long-term Investments 23.6 35.0
Assets, Fair Value Disclosure 31,982.8 38,703.6
Liabilities    
Liabilities, Fair Value Disclosure 44.4 59.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest Rate Swaps    
Liabilities    
Derivative Liabilities 0.1 0.5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign Exchange Contracts    
Liabilities    
Derivative Liabilities 44.2 59.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Embedded Derivative in Modified Coinsurance Arrangement    
Liabilities    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 541.9 1,247.4
Derivative Assets 0.0 0.0
Equity Securities 5.5 4.7
Other Long-term Investments 5.5 4.7
Assets, Fair Value Disclosure 547.4 1,252.1
Liabilities    
Liabilities, Fair Value Disclosure 21.2 39.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest Rate Swaps    
Liabilities    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Foreign Exchange Contracts    
Liabilities    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Embedded Derivative in Modified Coinsurance Arrangement    
Liabilities    
Derivative Liabilities 21.2 39.8
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Derivative Assets 0.0 0.0
Equity Securities 0.0 0.0
Other Long-term Investments 858.2 747.5
Assets, Fair Value Disclosure 858.2 747.5
Liabilities    
Liabilities, Fair Value Disclosure 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share | Interest Rate Swaps    
Liabilities    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share | Foreign Exchange Contracts    
Liabilities    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share | Embedded Derivative in Modified Coinsurance Arrangement    
Liabilities    
Derivative Liabilities 0.0 0.0
United States Government and Government Agencies and Authorities    
Fixed Maturity Securities    
Fixed Maturity Securities 592.1 709.8
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 102.8 0.0
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 489.3 709.8
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
States, Municipalities, and Political Subdivisions    
Fixed Maturity Securities    
Fixed Maturity Securities 4,468.3 4,261.2
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 69.7 0.0
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 4,398.6 4,245.7
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 15.5
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Foreign Governments    
Fixed Maturity Securities    
Fixed Maturity Securities 1,143.4 1,168.2
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 1,121.9 1,146.4
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 21.5 21.8
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Public Utilities    
Fixed Maturity Securities    
Fixed Maturity Securities 6,617.4 6,962.3
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 712.5 131.9
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 5,800.4 6,644.7
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 104.5 185.7
Public Utilities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Mortgage/Asset-backed Securities    
Fixed Maturity Securities    
Fixed Maturity Securities 781.2 1,107.7
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 766.3 1,026.4
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 14.9 81.3
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Corporate Debt Securities    
Fixed Maturity Securities    
Fixed Maturity Securities 29,907.2 29,918.6
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 10,127.7 4,089.4
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 19,378.5 24,886.1
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 401.0 943.1
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Redeemable Preferred Stocks    
Fixed Maturity Securities    
Fixed Maturity Securities 4.2 9.5
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 4.2 9.5
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Forwards    
Fixed Maturity Securities    
Derivative Assets 0.4  
Forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Derivative Assets 0.0  
Forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Derivative Assets 0.4  
Forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Derivative Assets 0.0  
Forwards | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Derivative Assets 0.0  
Foreign Exchange Contracts    
Fixed Maturity Securities    
Derivative Assets 23.0 19.7
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Derivative Assets 0.0 0.0
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Derivative Assets 23.0 19.7
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Derivative Assets 0.0 0.0
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Derivative Assets 0.0 0.0
Credit Default Swaps    
Fixed Maturity Securities    
Derivative Assets   0.1
Liabilities    
Derivative Liabilities 0.1  
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Derivative Assets   0.0
Liabilities    
Derivative Liabilities 0.0  
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Derivative Assets   0.1
Liabilities    
Derivative Liabilities 0.1  
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Derivative Assets   0.0
Liabilities    
Derivative Liabilities 0.0  
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Derivative Assets   0.0
Liabilities    
Derivative Liabilities 0.0  
Private Equity Funds    
Fixed Maturity Securities    
Alternative Investments 858.2 747.5
Private Equity Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Alternative Investments 0.0 0.0
Private Equity Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Alternative Investments 0.0 0.0
Private Equity Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Alternative Investments 0.0 0.0
Private Equity Funds | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Alternative Investments 858.2 747.5
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Liabilities    
Derivative Liabilities 0.0 0.0
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Liabilities    
Derivative Liabilities 44.4 59.7
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Liabilities    
Derivative Liabilities 21.2 39.8
Derivatives | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Liabilities    
Derivative Liabilities $ 0.0 $ 0.0