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Fair Value Measurements by Input Level (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Fixed Maturity Securities    
Fixed Maturity Securities $ 45,291.5 $ 47,443.7
Derivative Assets 87.9 27.5
Equity Securities 14.9 32.6
Other Long-term Investments 917.5 844.2
Assets, Fair Value Disclosure 46,032.4 48,120.5
Liabilities    
Derivative Liabilities 142.3 57.4
Liabilities, Fair Value Disclosure 142.3 57.4
Interest Rate Swaps    
Liabilities    
Derivative Liabilities   0.6
Foreign Exchange Contracts    
Liabilities    
Derivative Liabilities 32.6 34.0
Embedded Derivative in Modified Coinsurance Arrangement    
Liabilities    
Derivative Liabilities 109.7 22.8
Fair Value, Measurements, Recurring    
Fixed Maturity Securities    
Other Long-term Investments 740.9 676.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 7,812.6 4,698.3
Derivative Assets 0.0 0.0
Equity Securities 4.7 0.0
Other Long-term Investments 4.7 0.0
Assets, Fair Value Disclosure 7,817.3 4,698.3
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
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 36,772.3 42,032.6
Derivative Assets 87.9 27.5
Equity Securities 5.6 28.0
Other Long-term Investments 93.5 55.5
Assets, Fair Value Disclosure 36,865.8 42,088.1
Liabilities    
Liabilities, Fair Value Disclosure 32.6 34.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest Rate Swaps    
Liabilities    
Derivative Liabilities   0.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign Exchange Contracts    
Liabilities    
Derivative Liabilities 32.6 34.0
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 706.6 712.8
Derivative Assets 0.0 0.0
Equity Securities 4.6 4.6
Other Long-term Investments 4.6 4.6
Assets, Fair Value Disclosure 711.2 717.4
Liabilities    
Liabilities, Fair Value Disclosure 109.7 22.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest Rate Swaps    
Liabilities    
Derivative Liabilities   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 109.7 22.8
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 638.1 616.7
Assets, Fair Value Disclosure 638.1 616.7
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
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
US Treasury and Government [Member]    
Fixed Maturity Securities    
Fixed Maturity Securities 1,382.7 1,401.7
US Treasury and Government [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 109.7 412.8
US Treasury and Government [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 1,273.0 988.9
US Treasury and Government [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
US Treasury and Government [Member] | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
US States and Political Subdivisions Debt Securities [Member]    
Fixed Maturity Securities    
Fixed Maturity Securities 3,647.4 3,363.4
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 3,616.1 3,321.6
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 31.3 41.8
US States and Political Subdivisions Debt Securities [Member] | 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 958.3 1,017.7
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 937.4 995.9
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 20.9 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 7,550.9 7,732.2
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 311.7 171.1
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 7,212.9 7,546.5
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 26.3 14.6
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 1,445.7 1,478.7
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 1,370.6 1,444.6
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 75.1 34.1
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 30,264.1 32,410.4
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 7,391.2 4,114.4
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 22,319.9 27,695.5
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 553.0 600.5
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 42.4 39.6
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 42.4 39.6
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
Interest Rate Swaps    
Fixed Maturity Securities    
Derivative Assets 0.9  
Interest Rate Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Derivative Assets 0.0  
Interest Rate Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Derivative Assets 0.9  
Interest Rate Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Derivative Assets 0.0  
Interest Rate Swaps | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Derivative Assets 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 85.3 27.0
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 85.3 27.0
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 1.3 0.5
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Derivative Assets 0.0 0.0
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Derivative Assets 1.3 0.5
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Derivative Assets 0.0 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 0.0
Private Equity Funds [Member]    
Fixed Maturity Securities    
Alternative Investments 638.1 616.7
Private Equity Funds [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Alternative Investments 0.0 0.0
Private Equity Funds [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Alternative Investments 0.0 0.0
Private Equity Funds [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Alternative Investments 0.0 0.0
Private Equity Funds [Member] | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Alternative Investments 638.1 616.7
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 32.6 34.6
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Liabilities    
Derivative Liabilities 109.7 22.8
Derivatives | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Liabilities    
Derivative Liabilities $ 0.0 $ 0.0