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Fair Value Measurements by Input Level (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Fixed Maturity Securities    
Fixed Maturity Securities $ 48,233.4 $ 47,443.7
Derivative Assets 63.1 27.5
Equity Securities 24.8 32.6
Other Long-term Investments 933.9 844.2
Assets, Fair Value Disclosure 48,987.9 48,120.5
Liabilities    
Derivative Liabilities 99.7 57.4
Liabilities, Fair Value Disclosure 99.7 57.4
Interest Rate Swaps    
Liabilities    
Derivative Liabilities   0.6
Foreign Exchange Contracts    
Liabilities    
Derivative Liabilities 31.9 34.0
Embedded Derivative in Modified Coinsurance Arrangement    
Liabilities    
Derivative Liabilities 67.8 22.8
Fair Value, Measurements, Recurring    
Fixed Maturity Securities    
Other Long-term Investments 754.5 676.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 8,708.4 4,698.3
Derivative Assets 0.0 0.0
Equity Securities 20.1 0.0
Other Long-term Investments 20.1 0.0
Assets, Fair Value Disclosure 8,728.5 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 38,459.2 42,032.6
Derivative Assets 63.1 27.5
Equity Securities 0.2 28.0
Other Long-term Investments 63.3 55.5
Assets, Fair Value Disclosure 38,522.5 42,088.1
Liabilities    
Liabilities, Fair Value Disclosure 31.9 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 31.9 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 1,065.8 712.8
Derivative Assets 0.0 0.0
Equity Securities 4.5 4.6
Other Long-term Investments 4.5 4.6
Assets, Fair Value Disclosure 1,070.3 717.4
Liabilities    
Liabilities, Fair Value Disclosure 67.8 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 67.8 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 666.6 616.7
Assets, Fair Value Disclosure 666.6 616.7
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
United States Government and Government Agencies and Authorities    
Fixed Maturity Securities    
Fixed Maturity Securities 1,366.3 1,401.7
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 120.4 412.8
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 1,245.9 988.9
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 3,482.9 3,363.4
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 3,469.1 3,321.6
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 13.8 41.8
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 1,068.8 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 1,046.8 995.9
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 22.0 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 7,923.0 7,732.2
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 327.2 171.1
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 7,286.6 7,546.5
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 309.2 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 1,467.8 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 1,293.5 1,444.6
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 174.3 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 32,915.2 32,410.4
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 8,260.8 4,114.4
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 24,107.9 27,695.5
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 546.5 600.5
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 9.4 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 9.4 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 0.6  
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 0.6  
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 0.3  
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 0.3  
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 61.7 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 61.7 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 0.5 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 0.5 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    
Fixed Maturity Securities    
Alternative Investments 666.6 616.7
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 666.6 616.7
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 31.9 34.6
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Liabilities    
Derivative Liabilities 67.8 22.8
Derivatives | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Liabilities    
Derivative Liabilities $ 0.0 $ 0.0