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Fair Value Measurements by Input Level (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities |  | $ 33,190.2 |  | $ 35,629.9 |
Equity Securities |  | 23.2 |  | 24.5 |
Other Long-term Investments |  | $ 1,682.2 |  | $ 1,694.4 |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | Other Long-term Investments |  | Other Long-term Investments |
Derivative Assets |  | $ 70.5 |  | $ 90.9 |
Assets, Fair Value Disclosure |  | $ 34,740.2 |  | $ 37,195.9 |
Liabilities |  |  |  |  |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] |  | Other Liabilities |  | Other Liabilities |
Derivative Liabilities |  | $ 259.6 |  | $ 255.7 |
Liabilities, Fair Value Disclosure |  | 259.6 |  | 255.7 |
Forwards |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Derivative Assets |  | 5.0 |  | 6.5 |
Liabilities |  |  |  |  |
Derivative Liabilities |  | 208.2 |  | 223.2 |
Interest Rate Swaps |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Derivative Assets |  | 51.6 |  | 72.9 |
Liabilities |  |  |  |  |
Derivative Liabilities |  | 51.4 |  | 32.5 |
Embedded Derivative in Modified Coinsurance Arrangement |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Derivative Assets |  | 13.9 |  | 11.5 |
Fair Value, Measurements, Recurring |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Other Long-term Investments |  | 1,550.0 |  | 1,566.0 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities |  | 6,711.8 |  | 4,180.5 |
Equity Securities |  | 0.0 |  | 0.0 |
Other Long-term Investments |  | 0.0 |  | 0.0 |
Assets, Fair Value Disclosure |  | 6,711.8 |  | 4,180.5 |
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 |  | 26,335.4 |  | 31,304.4 |
Equity Securities |  | 0.2 |  | 0.1 |
Other Long-term Investments |  | 56.8 |  | 79.5 |
Derivative Assets |  | 56.6 |  | 79.4 |
Assets, Fair Value Disclosure |  | 26,392.2 |  | 31,383.9 |
Liabilities |  |  |  |  |
Derivative Liabilities |  | 259.6 |  | 255.7 |
Liabilities, Fair Value Disclosure |  | 259.6 |  | 255.7 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Forwards |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Derivative Assets |  | 5.0 |  | 6.5 |
Liabilities |  |  |  |  |
Derivative Liabilities |  | 208.2 |  | 223.2 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest Rate Swaps |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Derivative Assets |  | 51.6 |  | 72.9 |
Liabilities |  |  |  |  |
Derivative Liabilities |  | 51.4 |  | 32.5 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities |  | 143.0 |  | 145.0 |
Equity Securities |  | 23.0 |  | 24.4 |
Other Long-term Investments |  | 36.9 |  | 35.9 |
Derivative Assets |  | 13.9 |  | 11.5 |
Assets, Fair Value Disclosure |  | 179.9 |  | 180.9 |
Liabilities |  |  |  |  |
Liabilities, Fair Value Disclosure |  | 0.0 |  | 0.0 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Embedded Derivative in Modified Coinsurance Arrangement |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Derivative Assets |  | 13.9 |  | 11.5 |
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 |  | 1,456.3 |  | 1,450.6 |
Assets, Fair Value Disclosure |  | 1,456.3 |  | 1,450.6 |
Liabilities |  |  |  |  |
Liabilities, Fair Value Disclosure |  | 0.0 |  | 0.0 |
United States Government and Government Agencies and Authorities |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities |  | 544.0 |  | 530.5 |
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities |  | 79.7 |  | 77.9 |
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities |  | 464.3 |  | 452.6 |
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 |  | 3,068.0 |  | 3,291.4 |
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 |  | 3,068.0 |  | 3,291.4 |
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 |  | 879.5 |  | 768.1 |
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 |  | 879.5 |  | 768.1 |
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 |  | 4,888.8 |  | 5,292.9 |
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities |  | 471.6 |  | 174.5 |
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities |  | 4,417.2 |  | 5,118.4 |
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 |  | 1,121.6 | [1] | 917.2 | [2]
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities | [1] | 0.0 |  | 0.0 |
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities | [1] | 1,022.6 |  | 843.7 |
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities | [1] | 99.0 |  | 73.5 |
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities | [1] | 0.0 |  | 0.0 |
All Other Corporate Bonds |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities |  | 22,680.5 |  | 24,822.2 |
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities |  | 6,160.5 |  | 3,928.1 |
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities |  | 16,476.0 |  | 20,822.6 |
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Fixed Maturity Securities |  | 44.0 |  | 71.5 |
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 |  | 7.8 |  | 7.6 |
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 |  | 7.8 |  | 7.6 |
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 |
Private Equity Partnerships |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |
Alternative Investments |  | 1,456.3 |  | 1,450.6 |
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 |  | $ 1,456.3 |  | $ 1,450.6 |
[1] | 1 Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types
[2] | 1 Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types

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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/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 2: 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 3: 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 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 7: 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 8: 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 9: 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 10: 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 11: 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 12: 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 portion of asset recognized for present right to economic benefit. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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