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Fair Value Measurements by Input Level (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Fixed Maturity Securities    
Fixed Maturity Securities $ 42,076.0 $ 44,137.3
Derivative Assets 17.6 19.8
Equity Securities 31.5 28.3
Other Long-term Investments 995.3 960.2
Assets, Fair Value Disclosure 42,917.5 44,932.9
Liabilities    
Derivative Liabilities 77.8 99.5
Liabilities, Fair Value Disclosure 77.8 99.5
Interest Rate Swaps    
Liabilities    
Derivative Liabilities 0.1 0.5
Foreign Exchange Contracts    
Liabilities    
Derivative Liabilities 54.8 59.2
Embedded Derivative in Modified Coinsurance Arrangement    
Liabilities    
Derivative Liabilities 22.9 39.8
Fair Value, Measurements, Recurring    
Fixed Maturity Securities    
Other Long-term Investments 841.5 795.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 9,893.8 4,221.3
Derivative Assets 0.0 0.0
Equity Securities 26.1 8.4
Other Long-term Investments 26.1 8.4
Assets, Fair Value Disclosure 9,919.9 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 31,480.7 38,668.6
Derivative Assets 17.6 19.8
Equity Securities 0.2 15.2
Other Long-term Investments 17.8 35.0
Assets, Fair Value Disclosure 31,498.5 38,703.6
Liabilities    
Liabilities, Fair Value Disclosure 54.9 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 54.8 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 701.5 1,247.4
Derivative Assets 0.0 0.0
Equity Securities 5.2 4.7
Other Long-term Investments 5.2 4.7
Assets, Fair Value Disclosure 706.7 1,252.1
Liabilities    
Liabilities, Fair Value Disclosure 22.9 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 22.9 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 792.4 747.5
Assets, Fair Value Disclosure 792.4 747.5
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 576.6 709.8
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 101.1 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 475.5 709.8
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 4,203.9 4,261.2
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 54.1 0.0
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 4,149.8 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 1,120.6 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 1,098.9 1,146.4
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 21.7 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 6,444.5 6,962.3
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 594.2 131.9
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 5,746.9 6,644.7
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 103.4 185.7
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 925.1 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 847.9 1,026.4
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 77.2 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 28,801.2 29,918.6
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 9,144.4 4,089.4
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 19,157.6 24,886.1
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 499.2 943.1
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 4.1 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 4.1 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 0.1  
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 0.1  
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 17.4 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 17.4 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 0.1
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 0.1 0.1
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 792.4 747.5
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 792.4 747.5
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 54.9 59.7
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Liabilities    
Derivative Liabilities 22.9 39.8
Derivatives | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Liabilities    
Derivative Liabilities $ 0.0 $ 0.0