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Fair Value Measurements by Fair Value Heirarchy Input Level (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Fixed Maturity Securities    
Fixed Maturity Securities $ 43,071.3 $ 45,457.8
Derivative Assets 20.9 19.5
Other Long-term Investments 694.2 646.8
Liabilities    
Liabilities, Fair Value Disclosure 3,341.1 3,402.4
Fair Value, Inputs, Level 1    
Liabilities    
Liabilities, Fair Value Disclosure 47.7 1,171.8
Fair Value, Inputs, Level 2    
Liabilities    
Liabilities, Fair Value Disclosure 3,293.4 2,230.6
Fair Value, Inputs, Level 3    
Liabilities    
Liabilities, Fair Value Disclosure 0.0 0.0
United States Government and Government Agencies and Authorities    
Fixed Maturity Securities    
Fixed Maturity Securities 1,779.5 1,482.5
States, Municipalities, and Political Subdivisions    
Fixed Maturity Securities    
Fixed Maturity Securities 2,320.0 2,336.9
Foreign Governments    
Fixed Maturity Securities    
Fixed Maturity Securities 798.4 863.9
Public Utilities    
Fixed Maturity Securities    
Fixed Maturity Securities 7,389.9 8,236.5
Mortgage/Asset-backed Securities    
Fixed Maturity Securities    
Fixed Maturity Securities 1,627.0 1,973.6
Redeemable Preferred Stocks    
Fixed Maturity Securities    
Fixed Maturity Securities 40.4 42.0
Private Equity Partnerships    
Fixed Maturity Securities    
Alternative Investments 466.7  
Fair Value, Measurements, Recurring    
Fixed Maturity Securities    
Fixed Maturity Securities 43,071.3 45,457.8
Equity Securities 28.6 11.7
Other Long-term Investments 516.2 438.4
Assets, Fair Value Disclosure 43,587.5 45,896.2
Liabilities    
Liabilities, Fair Value Disclosure 60.3 68.1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 8,812.0 4,170.4
Equity Securities 14.9 0.2
Other Long-term Investments 14.9 0.2
Assets, Fair Value Disclosure 8,826.9 4,170.6
Liabilities    
Liabilities, Fair Value Disclosure 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 33,127.6 39,906.8
Equity Securities 12.6 10.4
Other Long-term Investments 33.5 29.9
Assets, Fair Value Disclosure 33,161.1 39,936.7
Liabilities    
Liabilities, Fair Value Disclosure 46.5 52.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 1,131.7 1,380.6
Equity Securities 1.1 1.1
Other Long-term Investments 1.1 1.1
Assets, Fair Value Disclosure 1,132.8 1,381.7
Liabilities    
Liabilities, Fair Value Disclosure 13.8 15.9
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Equity Securities 0.0 0.0
Other Long-term Investments 466.7 407.2
Assets, Fair Value Disclosure 466.7 407.2
Liabilities    
Liabilities, Fair Value Disclosure 0.0 0.0
Fair Value, Measurements, Recurring | United States Government and Government Agencies and Authorities    
Fixed Maturity Securities    
Fixed Maturity Securities 1,779.5 1,482.5
Fair Value, Measurements, Recurring | United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 679.6 460.1
Fair Value, Measurements, Recurring | United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 1,099.9 1,022.4
Fair Value, Measurements, Recurring | United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | United States Government and Government Agencies and Authorities | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | States, Municipalities, and Political Subdivisions    
Fixed Maturity Securities    
Fixed Maturity Securities 2,320.0 2,336.9
Fair Value, Measurements, Recurring | States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 2,256.1 2,336.9
Fair Value, Measurements, Recurring | States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 63.9 0.0
Fair Value, Measurements, Recurring | States, Municipalities, and Political Subdivisions | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Foreign Governments    
Fixed Maturity Securities    
Fixed Maturity Securities 798.4 863.9
Fair Value, Measurements, Recurring | Foreign Governments | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Foreign Governments | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 766.8 863.9
Fair Value, Measurements, Recurring | Foreign Governments | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 31.6 0.0
Fair Value, Measurements, Recurring | Foreign Governments | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Public Utilities    
Fixed Maturity Securities    
Fixed Maturity Securities 7,389.9 8,236.5
Fair Value, Measurements, Recurring | Public Utilities | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 333.7 154.2
Fair Value, Measurements, Recurring | Public Utilities | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 6,933.8 7,874.6
Fair Value, Measurements, Recurring | Public Utilities | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 122.4 207.7
Fair Value, Measurements, Recurring | Public Utilities | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Mortgage/Asset-backed Securities    
Fixed Maturity Securities    
Fixed Maturity Securities 1,627.0 1,973.6
Fair Value, Measurements, Recurring | Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 1,626.5 1,973.6
Fair Value, Measurements, Recurring | Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 0.5 0.0
Fair Value, Measurements, Recurring | Mortgage/Asset-backed Securities | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | All Other Corporate Bonds    
Fixed Maturity Securities    
Fixed Maturity Securities 29,116.1 30,522.4
Fair Value, Measurements, Recurring | All Other Corporate Bonds | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 7,798.7 3,556.1
Fair Value, Measurements, Recurring | All Other Corporate Bonds | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 20,425.6 25,816.2
Fair Value, Measurements, Recurring | All Other Corporate Bonds | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 891.8 1,150.1
Fair Value, Measurements, Recurring | All Other Corporate Bonds | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Redeemable Preferred Stocks    
Fixed Maturity Securities    
Fixed Maturity Securities 40.4 42.0
Fair Value, Measurements, Recurring | Redeemable Preferred Stocks | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Redeemable Preferred Stocks | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 18.9 19.2
Fair Value, Measurements, Recurring | Redeemable Preferred Stocks | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 21.5 22.8
Fair Value, Measurements, Recurring | Redeemable Preferred Stocks | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Foreign Exchange Contracts    
Fixed Maturity Securities    
Derivative Assets 20.4 19.5
Fair Value, Measurements, Recurring | Foreign Exchange Contracts | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | Foreign Exchange Contracts | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Derivative Assets 20.4 19.5
Fair Value, Measurements, Recurring | Foreign Exchange Contracts | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | Foreign Exchange Contracts | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | Credit Default Swaps    
Fixed Maturity Securities    
Derivative Assets 0.5  
Fair Value, Measurements, Recurring | Credit Default Swaps | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Derivative Assets 0.0  
Fair Value, Measurements, Recurring | Credit Default Swaps | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Derivative Assets 0.5  
Fair Value, Measurements, Recurring | Credit Default Swaps | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Derivative Assets 0.0  
Fair Value, Measurements, Recurring | Credit Default Swaps | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Derivative Assets 0.0  
Fair Value, Measurements, Recurring | Private Equity Partnerships    
Fixed Maturity Securities    
Alternative Investments 466.7 407.2
Fair Value, Measurements, Recurring | Private Equity Partnerships | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Alternative Investments 0.0 0.0
Fair Value, Measurements, Recurring | Private Equity Partnerships | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Alternative Investments 0.0 0.0
Fair Value, Measurements, Recurring | Private Equity Partnerships | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Alternative Investments 0.0 0.0
Fair Value, Measurements, Recurring | Private Equity Partnerships | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Alternative Investments 466.7 407.2
Fair Value, Measurements, Recurring | Derivatives    
Liabilities    
Derivative Liabilities 60.3 68.1
Fair Value, Measurements, Recurring | Derivatives | Fair Value, Inputs, Level 1    
Liabilities    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Derivatives | Fair Value, Inputs, Level 2    
Liabilities    
Derivative Liabilities 46.5 52.2
Fair Value, Measurements, Recurring | Derivatives | Fair Value, Inputs, Level 3    
Liabilities    
Derivative Liabilities 13.8 15.9
Fair Value, Measurements, Recurring | Derivatives | Fair Value Measured at Net Asset Value Per Share    
Liabilities    
Derivative Liabilities 0.0 0.0
Interest Rate Swaps | Fair Value, Measurements, Recurring    
Liabilities    
Derivative Liabilities 7.3 5.1
Interest Rate Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Liabilities    
Derivative Liabilities 0.0 0.0
Interest Rate Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Liabilities    
Derivative Liabilities 7.3 5.1
Interest Rate Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Liabilities    
Derivative Liabilities 0.0 0.0
Interest Rate Swaps | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Liabilities    
Derivative Liabilities 0.0 0.0
Foreign Exchange Contracts | Fair Value, Measurements, Recurring    
Liabilities    
Derivative Liabilities 39.2 46.9
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Liabilities    
Derivative Liabilities 0.0 0.0
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Liabilities    
Derivative Liabilities 39.2 46.9
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Liabilities    
Derivative Liabilities 0.0 0.0
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Liabilities    
Derivative Liabilities 0.0 0.0
Credit Default Swaps | Fair Value, Measurements, Recurring    
Liabilities    
Derivative Liabilities   0.2
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Liabilities    
Derivative Liabilities   0.0
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Liabilities    
Derivative Liabilities   0.2
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Liabilities    
Derivative Liabilities   0.0
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Liabilities    
Derivative Liabilities   0.0
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Measurements, Recurring    
Liabilities    
Derivative Liabilities 13.8 15.9
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Liabilities    
Derivative Liabilities 0.0 0.0
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Liabilities    
Derivative Liabilities 0.0 0.0
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Liabilities    
Derivative Liabilities 13.8 15.9
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Liabilities    
Derivative Liabilities $ 0.0 $ 0.0