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Fair Value Measurements by Fair Value Heirarchy Input Level (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Assets, Fair Value Disclosure    
Fixed Maturity Securities $ 43,360.9 $ 45,457.8
Derivative Assets 25.2 19.5
Other Long-term Investments 687.5 646.8
Liabilities    
Liabilities, Fair Value Disclosure 3,421.9 3,402.4
Fair Value, Inputs, Level 1    
Liabilities    
Liabilities, Fair Value Disclosure 2,642.6 1,171.8
Fair Value, Inputs, Level 2    
Liabilities    
Liabilities, Fair Value Disclosure 779.3 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    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 1,659.1 1,482.5
States, Municipalities, and Political Subdivisions    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 2,353.8 2,336.9
Foreign Governments    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 822.9 863.9
Public Utilities    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 7,526.3 8,236.5
Mortgage/Asset-backed Securities    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 1,705.9 1,973.6
Redeemable Preferred Stocks    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 40.6 42.0
Private Equity Partnerships    
Assets, Fair Value Disclosure    
Alternative Investments 446.2  
Fair Value, Measurements, Recurring    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 43,360.9 45,457.8
Equity Securities 28.0 11.7
Other Long-term Investments 499.4 438.4
Assets, Fair Value Disclosure 43,860.3 45,896.2
Liabilities    
Liabilities, Fair Value Disclosure 66.6 68.1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 8,297.1 4,170.4
Equity Securities 14.4 0.2
Other Long-term Investments 14.4 0.2
Assets, Fair Value Disclosure 8,311.5 4,170.6
Liabilities    
Liabilities, Fair Value Disclosure 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 33,988.2 39,906.8
Equity Securities 12.5 10.4
Other Long-term Investments 37.7 29.9
Assets, Fair Value Disclosure 34,025.9 39,936.7
Liabilities    
Liabilities, Fair Value Disclosure 46.7 52.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 1,075.6 1,380.6
Equity Securities 1.1 1.1
Other Long-term Investments 1.1 1.1
Assets, Fair Value Disclosure 1,076.7 1,381.7
Liabilities    
Liabilities, Fair Value Disclosure 19.9 15.9
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Equity Securities 0.0 0.0
Other Long-term Investments 446.2 407.2
Assets, Fair Value Disclosure 446.2 407.2
Liabilities    
Liabilities, Fair Value Disclosure 0.0 0.0
Fair Value, Measurements, Recurring | United States Government and Government Agencies and Authorities    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 1,659.1 1,482.5
Fair Value, Measurements, Recurring | United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 494.7 460.1
Fair Value, Measurements, Recurring | United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 1,164.4 1,022.4
Fair Value, Measurements, Recurring | United States Government and Government Agencies and Authorities | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
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    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | States, Municipalities, and Political Subdivisions    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 2,353.8 2,336.9
Fair Value, Measurements, Recurring | States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 2,317.3 2,336.9
Fair Value, Measurements, Recurring | States, Municipalities, and Political Subdivisions | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 36.5 0.0
Fair Value, Measurements, Recurring | States, Municipalities, and Political Subdivisions | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Foreign Governments    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 822.9 863.9
Fair Value, Measurements, Recurring | Foreign Governments | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Foreign Governments | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 791.4 863.9
Fair Value, Measurements, Recurring | Foreign Governments | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 31.5 0.0
Fair Value, Measurements, Recurring | Foreign Governments | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Public Utilities    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 7,526.3 8,236.5
Fair Value, Measurements, Recurring | Public Utilities | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 537.1 154.2
Fair Value, Measurements, Recurring | Public Utilities | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 6,820.0 7,874.6
Fair Value, Measurements, Recurring | Public Utilities | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 169.2 207.7
Fair Value, Measurements, Recurring | Public Utilities | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Mortgage/Asset-backed Securities    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 1,705.9 1,973.6
Fair Value, Measurements, Recurring | Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 1,705.4 1,973.6
Fair Value, Measurements, Recurring | Mortgage/Asset-backed Securities | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.5 0.0
Fair Value, Measurements, Recurring | Mortgage/Asset-backed Securities | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | All Other Corporate Bonds    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 29,252.3 30,522.4
Fair Value, Measurements, Recurring | All Other Corporate Bonds | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 7,265.3 3,556.1
Fair Value, Measurements, Recurring | All Other Corporate Bonds | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 21,170.7 25,816.2
Fair Value, Measurements, Recurring | All Other Corporate Bonds | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 816.3 1,150.1
Fair Value, Measurements, Recurring | All Other Corporate Bonds | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Redeemable Preferred Stocks    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 40.6 42.0
Fair Value, Measurements, Recurring | Redeemable Preferred Stocks | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Redeemable Preferred Stocks | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 19.0 19.2
Fair Value, Measurements, Recurring | Redeemable Preferred Stocks | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 21.6 22.8
Fair Value, Measurements, Recurring | Redeemable Preferred Stocks | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Fair Value, Measurements, Recurring | Foreign Exchange Contracts    
Assets, Fair Value Disclosure    
Derivative Assets 25.2 19.5
Fair Value, Measurements, Recurring | Foreign Exchange Contracts | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | Foreign Exchange Contracts | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Derivative Assets 25.2 19.5
Fair Value, Measurements, Recurring | Foreign Exchange Contracts | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | Foreign Exchange Contracts | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | Private Equity Partnerships    
Assets, Fair Value Disclosure    
Alternative Investments 446.2 407.2
Fair Value, Measurements, Recurring | Private Equity Partnerships | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Alternative Investments 0.0 0.0
Fair Value, Measurements, Recurring | Private Equity Partnerships | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Alternative Investments 0.0 0.0
Fair Value, Measurements, Recurring | Private Equity Partnerships | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Alternative Investments 0.0 0.0
Fair Value, Measurements, Recurring | Private Equity Partnerships | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Alternative Investments 446.2 407.2
Fair Value, Measurements, Recurring | Derivatives    
Liabilities    
Derivative Liabilities 66.6 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 46.7 52.2
Fair Value, Measurements, Recurring | Derivatives | Fair Value, Inputs, Level 3    
Liabilities    
Derivative Liabilities 19.9 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 7.4 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 7.4 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 39.3 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 39.3 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 19.9 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 19.9 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