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Fair Value Measurements by Input Level (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | $ 35,952.8 | $ 36,833.9
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Equity Securities | $ 21.8 | $ 31.9
Other Long-term Investments | 1,646.3 | 1,579.4
Assets, Fair Value Disclosure | 37,480.7 | 38,291.9
Derivative Assets | $ 99.2 | $ 99.9
Liabilities |  |
Derivative Liabilities location | Other Liabilities | Other Liabilities
Liabilities, Fair Value Disclosure | $ 173.6 | $ 117.7
Derivative Liabilities | 173.6 | 117.7
Forwards |  |
Liabilities |  |
Derivative Liabilities | 143.7 | 78.0
Foreign Exchange Contracts |  |
Liabilities |  |
Derivative Liabilities | 29.9 | 38.2
Embedded Derivative in Modified Coinsurance Arrangement |  |
Liabilities |  |
Derivative Liabilities |  | 1.5
Fair Value, Measurements, Recurring |  |
Assets, Fair Value Disclosure |  |
Other Long-term Investments | 1,527.9 | 1,458.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 7,783.2 | 4,286.5
Equity Securities | 0.0 | 0.0
Other Long-term Investments | 0.0 | 0.0
Assets, Fair Value Disclosure | 7,783.2 | 4,286.5
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 | 28,069.8 | 32,391.1
Equity Securities | 0.1 | 10.3
Other Long-term Investments | 93.9 | 110.2
Assets, Fair Value Disclosure | 28,163.7 | 32,501.3
Derivative Assets | 93.8 | 99.9
Liabilities |  |
Liabilities, Fair Value Disclosure | 173.6 | 116.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Forwards |  |
Liabilities |  |
Derivative Liabilities | 143.7 | 78.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign Exchange Contracts |  |
Liabilities |  |
Derivative Liabilities | 29.9 | 38.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 99.8 | 156.3
Equity Securities | 21.7 | 21.6
Other Long-term Investments | 27.1 | 21.6
Assets, Fair Value Disclosure | 126.9 | 177.9
Derivative Assets | 5.4 |
Liabilities |  |
Liabilities, Fair Value Disclosure | 0.0 | 1.5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Embedded Derivative in Modified Coinsurance Arrangement |  |
Liabilities |  |
Derivative Liabilities |  | 1.5
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 | 1,406.9 | 1,326.2
Assets, Fair Value Disclosure | 1,406.9 | 1,326.2
Liabilities |  |
Liabilities, Fair Value Disclosure | 0.0 | 0.0
United States Government and Government Agencies and Authorities |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 559.0 | 624.8
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 78.6 | 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 | 480.4 | 624.8
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 | 3,449.3 | 3,678.4
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 0.0 | 0.0
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 3,449.3 | 3,678.4
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 0.0 | 0.0
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 | 829.9 | 890.7
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 | 829.9 | 890.7
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 0.0 | 0.0
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 | 5,299.4 | 5,321.6
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 590.9 | 301.3
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 4,708.5 | 5,020.3
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 0.0 | 0.0
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 | 752.5 | 644.1
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 | 706.0 | 611.2
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 46.5 | 32.9
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
All Other Corporate Bonds |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 25,059.1 | 25,670.7
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 7,113.7 | 3,985.2
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 17,892.1 | 21,562.1
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 53.3 | 123.4
All Other Corporate Bonds | 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 | 3.6 | 3.6
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 | 3.6 | 3.6
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 | 24.3 | 47.5
Forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | 24.3 | 47.5
Foreign Exchange Contracts |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | 69.5 | 52.4
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | 69.5 | 52.4
Embedded Derivative in Modified Coinsurance Arrangement |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | 5.4 |
Embedded Derivative in Modified Coinsurance Arrangement | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | 5.4 |
Private Equity Partnerships |  |
Assets, Fair Value Disclosure |  |
Alternative Investments | 1,406.9 | 1,326.2
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Alternative Investments | 0.0 | 0.0
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Alternative Investments | 0.0 | 0.0
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Alternative Investments | 0.0 | 0.0
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share |  |
Assets, Fair Value Disclosure |  |
Alternative Investments | 1,406.9 | 1,326.2
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Liabilities |  |
Derivative Liabilities | $ 173.6 | 116.2
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Liabilities |  |
Derivative Liabilities |  | $ 1.5

X
- 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/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 54B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482134/820-10-35-54B Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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