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Fair Value Measurements by Input Level (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fixed Maturity Securities    
Fixed Maturity Securities $ 43,336.0 $ 44,137.3
Derivative Assets 39.5 19.8
Equity Securities 33.7 28.3
Other Long-term Investments 1,203.0 960.2
Assets, Fair Value Disclosure 44,387.8 44,932.9
Liabilities    
Derivative Liabilities 65.1 99.5
Liabilities, Fair Value Disclosure 65.1 99.5
Foreign Exchange Contracts    
Liabilities    
Derivative Liabilities 35.0 59.7
Embedded Derivative in Modified Coinsurance Arrangement    
Liabilities    
Derivative Liabilities 30.1 39.8
Fair Value, Measurements, Recurring    
Fixed Maturity Securities    
Other Long-term Investments 1,051.8 795.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 3,519.5 4,221.3
Derivative Assets 0.0 0.0
Equity Securities 0.0 8.4
Other Long-term Investments 0.0 8.4
Assets, Fair Value Disclosure 3,519.5 4,229.7
Liabilities    
Liabilities, Fair Value Disclosure 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 38,689.1 38,668.6
Derivative Assets 39.5 19.8
Equity Securities 27.9 15.2
Other Long-term Investments 67.4 35.0
Assets, Fair Value Disclosure 38,756.5 38,703.6
Liabilities    
Liabilities, Fair Value Disclosure 35.0 59.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign Exchange Contracts    
Liabilities    
Derivative Liabilities 35.0 59.7
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 1,127.4 1,247.4
Derivative Assets 0.0 0.0
Equity Securities 5.8 4.7
Other Long-term Investments 5.8 4.7
Assets, Fair Value Disclosure 1,133.2 1,252.1
Liabilities    
Liabilities, Fair Value Disclosure 30.1 39.8
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 30.1 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 978.6 747.5
Assets, Fair Value Disclosure 978.6 747.5
Liabilities    
Liabilities, Fair Value Disclosure 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 580.1 709.8
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 0.0 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 580.1 709.8
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 4,727.5 4,261.2
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 4,714.1 4,245.7
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 13.4 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 1,146.6 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 1,125.8 1,146.4
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 20.8 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 6,416.0 6,962.3
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 230.8 131.9
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 6,140.7 6,644.7
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 44.5 185.7
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 638.3 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 451.1 1,026.4
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 187.2 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
All Other Corporate Bonds    
Fixed Maturity Securities    
Fixed Maturity Securities 29,823.4 29,918.6
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Fixed Maturity Securities 3,288.7 4,089.4
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Fixed Maturity Securities 25,673.2 24,886.1
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Fixed Maturity Securities 861.5 943.1
All Other Corporate Bonds | 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
Foreign Exchange Contracts    
Fixed Maturity Securities    
Derivative Assets 39.5 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 39.5 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
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Derivative Assets   0.0
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Derivative Assets   0.1
Credit Default Swaps | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Derivative Assets   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
Private Equity Partnerships    
Fixed Maturity Securities    
Alternative Investments 978.6 747.5
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fixed Maturity Securities    
Alternative Investments 0.0 0.0
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fixed Maturity Securities    
Alternative Investments 0.0 0.0
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fixed Maturity Securities    
Alternative Investments 0.0 0.0
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Fixed Maturity Securities    
Alternative Investments 978.6 747.5
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 35.0 59.7
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Liabilities    
Derivative Liabilities 30.1 39.8
Derivatives | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Liabilities    
Derivative Liabilities $ 0.0 $ 0.0