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Fair Value Measurements by Input Level (Detail) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | $ 35,374.1 | $ 34,840.8
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Equity Securities | $ 27.8 | $ 25.8
Other Long-term Investments | 1,503.2 | 1,440.1
Assets, Fair Value Disclosure | $ 36,750.6 | $ 36,150.0
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Liabilities, Fair Value Disclosure | $ 84.8 | $ 87.9
Interest Rate Swaps |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Foreign Exchange Contracts |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Embedded Derivative in Modified Coinsurance Arrangement |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Fair Value, Measurements, Recurring |  |
Assets, Fair Value Disclosure |  |
Other Long-term Investments | $ 1,376.5 | $ 1,309.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | $ 8,564.7 | $ 4,519.1
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Equity Securities | $ 0.0 | $ 0.0
Other Long-term Investments | 0.0 | 0.0
Assets, Fair Value Disclosure | 8,564.7 | 4,519.1
Liabilities |  |
Liabilities, Fair Value Disclosure | $ 0.0 | $ 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Interest Rate Swaps |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Foreign Exchange Contracts |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Embedded Derivative in Modified Coinsurance Arrangement |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | $ 26,656.5 | $ 30,140.8
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Equity Securities | $ 10.3 | $ 9.6
Other Long-term Investments | 90.9 | 98.7
Assets, Fair Value Disclosure | 26,747.4 | 30,239.5
Liabilities |  |
Liabilities, Fair Value Disclosure | $ 76.4 | $ 74.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest Rate Swaps |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign Exchange Contracts |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Embedded Derivative in Modified Coinsurance Arrangement |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | $ 152.9 | $ 180.9
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Equity Securities | $ 17.5 | $ 16.2
Other Long-term Investments | 17.5 | 16.2
Assets, Fair Value Disclosure | 170.4 | 197.1
Liabilities |  |
Liabilities, Fair Value Disclosure | $ 8.4 | $ 13.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest Rate Swaps |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Foreign Exchange Contracts |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Embedded Derivative in Modified Coinsurance Arrangement |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
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 | Other Long-term Investments | Other Long-term Investments
Equity Securities | $ 0.0 | $ 0.0
Other Long-term Investments | 1,268.1 | 1,194.3
Assets, Fair Value Disclosure | 1,268.1 | 1,194.3
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 | Other Liabilities | Other Liabilities
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share | Foreign Exchange Contracts |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share | Embedded Derivative in Modified Coinsurance Arrangement |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
United States Government and Government Agencies and Authorities |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | $ 569.1 | $ 498.2
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 81.7 | 81.7
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 487.4 | 416.5
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 | 3,537.6 | 3,457.2
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 5.0 | 8.7
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 3,532.6 | 3,448.3
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 0.0 | 0.2
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 | 870.7 | 827.1
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 | 870.7 | 827.1
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 | 5,176.2 | 4,956.9
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 664.2 | 160.1
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 4,512.0 | 4,796.8
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 | 556.1 | 573.3
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 | 532.0 | 551.3
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 24.1 | 22.0
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 | 24,660.9 | 24,524.6
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 7,813.8 | 4,268.6
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 16,718.3 | 20,097.3
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Fixed Maturity Securities | 128.8 | 158.7
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 | 3.5 | 3.5
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 | 3.5 | 3.5
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 | 1,268.1 | 1,194.3
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 | $ 1,268.1 | $ 1,194.3
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Derivatives | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Derivatives | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share |  |
Liabilities |  |
Derivative Liabilities | Other Liabilities | Other Liabilities
Forwards |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Forwards | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Forwards | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Foreign Exchange Contracts |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | Other Long-term Investments | Other Long-term Investments
Foreign Exchange Contracts | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share |  |
Assets, Fair Value Disclosure |  |
Derivative Assets | Other Long-term Investments | Other Long-term Investments

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