XML 43 R33.htm IDEA: XBRL DOCUMENT v3.22.1
Fair Value Measurements by Input Level (Detail) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Assets, Fair Value Disclosure    
Fixed Maturity Securities $ 39,946.0 $ 43,336.0
Derivative Assets 47.3 39.5
Equity Securities 38.0 33.7
Other Long-term Investments 1,280.4 1,203.0
Assets, Fair Value Disclosure 41,077.2 44,387.8
Liabilities    
Derivative Liabilities 68.9 65.1
Liabilities, Fair Value Disclosure 68.9 65.1
Interest Rate Swaps    
Liabilities    
Derivative Liabilities 1.0  
Foreign Exchange Contracts    
Liabilities    
Derivative Liabilities 34.4 35.0
Embedded Derivative in Modified Coinsurance Arrangement    
Liabilities    
Derivative Liabilities 33.5 30.1
Fair Value, Measurements, Recurring    
Assets, Fair Value Disclosure    
Other Long-term Investments 1,131.2 1,051.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 8,271.5 3,519.5
Derivative Assets 0.0 0.0
Equity Securities 0.0
Other Long-term Investments 0.0 0.0
Assets, Fair Value Disclosure 8,271.5 3,519.5
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    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 31,509.9 38,689.1
Derivative Assets 47.3 39.5
Equity Securities 27.5 27.9
Other Long-term Investments 74.8 67.4
Assets, Fair Value Disclosure 31,584.7 38,756.5
Liabilities    
Liabilities, Fair Value Disclosure 35.4 35.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest Rate Swaps    
Liabilities    
Derivative Liabilities 1.0  
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign Exchange Contracts    
Liabilities    
Derivative Liabilities 34.4 35.0
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    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 164.6 1,127.4
Derivative Assets 0.0 0.0
Equity Securities 10.5 5.8
Other Long-term Investments 10.5 5.8
Assets, Fair Value Disclosure 175.1 1,133.2
Liabilities    
Liabilities, Fair Value Disclosure 33.5 30.1
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 33.5 30.1
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Derivative Assets 0.0 0.0
Equity Securities 0.0 0.0
Other Long-term Investments 1,045.9 978.6
Assets, Fair Value Disclosure 1,045.9 978.6
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    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 537.3 580.1
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 93.1 0.0
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 444.2 580.1
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
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    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
States, Municipalities, and Political Subdivisions    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 4,307.3 4,727.5
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 10.5 0.0
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 4,296.8 4,714.1
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 13.4
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Foreign Governments    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 1,064.7 1,146.6
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 1,044.3 1,125.8
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 20.4 20.8
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Public Utilities    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 5,848.6 6,416.0
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 530.1 230.8
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 5,304.8 6,140.7
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 13.7 44.5
Public Utilities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Mortgage/Asset-backed Securities    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 559.1 638.3
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 509.3 451.1
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 49.8 187.2
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Corporate Debt Securities    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 27,625.2 29,823.4
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 7,637.8 3,288.7
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 19,906.7 25,673.2
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 80.7 861.5
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Redeemable Preferred Stocks    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 3.8 4.1
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 3.8 4.1
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Foreign Exchange Contracts    
Assets, Fair Value Disclosure    
Derivative Assets 47.3 39.5
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Derivative Assets 0.0 0.0
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Derivative Assets 47.3 39.5
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Derivative Assets 0.0 0.0
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Derivative Assets 0.0 0.0
Private Equity Funds    
Assets, Fair Value Disclosure    
Alternative Investments 1,045.9 978.6
Private Equity Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Alternative Investments 0.0 0.0
Private Equity Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Alternative Investments 0.0 0.0
Private Equity Funds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Alternative Investments 0.0 0.0
Private Equity Funds | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Alternative Investments 1,045.9 978.6
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 35.4 35.0
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Liabilities    
Derivative Liabilities 33.5 30.1
Derivatives | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Liabilities    
Derivative Liabilities $ 0.0 $ 0.0