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Fair Value Measurements by Input Level (Detail) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | $ 36,576.4 | $ 43,336.0
Derivative Assets | 93.5 | 39.5
Equity Securities | 37.0 | 33.7
Other Long-term Investments | 1,391.6 | 1,203.0
Assets, Fair Value Disclosure | 37,826.9 | 44,387.8
Liabilities |  |
Derivative Liabilities | 64.6 | 65.1
Liabilities, Fair Value Disclosure | 64.6 | 65.1
Foreign Exchange Contracts |  |
Liabilities |  |
Derivative Liabilities | 27.5 | 35.0
Embedded Derivative in Modified Coinsurance Arrangement |  |
Liabilities |  |
Derivative Liabilities | 34.3 | 30.1
Interest Rate Swaps |  |
Liabilities |  |
Derivative Liabilities | 2.8 |
Fair Value, Measurements, Recurring |  |
Assets, Fair Value Disclosure |  |
Other Long-term Investments | 1,250.5 | 1,051.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 7,378.1 | 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 | 7,378.1 | 3,519.5
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 1 | Interest Rate Swaps |  |
Liabilities |  |
Derivative Liabilities | 0.0 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 29,049.4 | 38,689.1
Derivative Assets | 93.5 | 39.5
Equity Securities | 26.1 | 27.9
Other Long-term Investments | 119.6 | 67.4
Assets, Fair Value Disclosure | 29,169.0 | 38,756.5
Liabilities |  |
Liabilities, Fair Value Disclosure | 30.3 | 35.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign Exchange Contracts |  |
Liabilities |  |
Derivative Liabilities | 27.5 | 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 2 | Interest Rate Swaps |  |
Liabilities |  |
Derivative Liabilities | 2.8 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 148.9 | 1,127.4
Derivative Assets | 0.0 | 0.0
Equity Securities | 10.9 | 5.8
Other Long-term Investments | 10.9 | 5.8
Assets, Fair Value Disclosure | 159.8 | 1,133.2
Liabilities |  |
Liabilities, Fair Value Disclosure | 34.3 | 30.1
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 | 34.3 | 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 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 | 1,120.0 | 978.6
Assets, Fair Value Disclosure | 1,120.0 | 978.6
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
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share | Interest Rate Swaps |  |
Liabilities |  |
Derivative Liabilities | 0.0 |
United States Government and Government Agencies and Authorities |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 504.7 | 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 | 87.0 | 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 | 417.7 | 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 | 3,930.4 | 4,727.5
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 9.2 | 0.0
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 3,921.2 | 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 | 901.4 | 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 | 881.2 | 1,125.8
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 20.2 | 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 | 5,388.4 | 6,416.0
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 290.5 | 230.8
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 5,084.3 | 6,140.7
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 13.6 | 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 | 559.9 | 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 | 548.3 | 451.1
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 11.6 | 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 | 25,287.9 | 29,823.4
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 6,991.4 | 3,288.7
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 18,193.0 | 25,673.2
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 103.5 | 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 | 3.7 | 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 | 3.7 | 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
Forwards |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | 5.1 |
Forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | 0.0 |
Forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | 5.1 |
Forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | 0.0 |
Forwards | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | 0.0 |
Foreign Exchange Contracts |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | 88.4 | 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 | 88.4 | 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 | 1,120.0 | 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 | 1,120.0 | 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 | 30.3 | 35.0
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Liabilities |  |
Derivative Liabilities | 34.3 | 30.1
Derivatives | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share |  |
Liabilities |  |
Derivative Liabilities | $ 0.0 | $ 0.0

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI https://asc.fasb.org/extlink&oid=126972413&loc=SL7495116-110257 + Details
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