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Location and Fair Values of Derivative Financial Instruments (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative |  |
Derivative, Notional Amount | $ 3,547.8 | $ 2,983.7
Other Long-term Investments |  |
Derivative |  |
Asset Derivatives Fair Value | 99.2 | 99.9
Other Liabilities |  |
Derivative |  |
Liability Derivatives Fair Value | 173.6 | 117.7
Designated as Hedging Instrument |  |
Derivative |  |
Derivative, Notional Amount | 3,245.1 | 2,697.0
Designated as Hedging Instrument | Cash Flow Hedging |  |
Derivative |  |
Derivative, Notional Amount | 2,551.0 | 2,054.5
Designated as Hedging Instrument | Forwards | Cash Flow Hedging |  |
Derivative |  |
Derivative, Notional Amount | 2,405.0 | 1,905.0
Designated as Hedging Instrument | Interest Rate Swaps | Cash Flow Hedging |  |
Derivative |  |
Derivative, Notional Amount | 146.0 | 149.5
Designated as Hedging Instrument | Interest Rate Swaps | Fair Value Hedging |  |
Derivative |  |
Derivative, Notional Amount | 694.1 | 642.5
Designated as Hedging Instrument | Other Long-term Investments |  |
Derivative |  |
Asset Derivatives Fair Value | 90.6 | 96.9
Designated as Hedging Instrument | Other Long-term Investments | Cash Flow Hedging |  |
Derivative |  |
Asset Derivatives Fair Value | 37.2 | 58.7
Designated as Hedging Instrument | Other Long-term Investments | Forwards | Cash Flow Hedging |  |
Derivative |  |
Asset Derivatives Fair Value | 21.1 | 44.5
Designated as Hedging Instrument | Other Long-term Investments | Interest Rate Swaps | Cash Flow Hedging |  |
Derivative |  |
Asset Derivatives Fair Value | 16.1 | 14.2
Designated as Hedging Instrument | Other Long-term Investments | Interest Rate Swaps | Fair Value Hedging |  |
Derivative |  |
Asset Derivatives Fair Value | 53.4 | 38.2
Designated as Hedging Instrument | Other Liabilities |  |
Derivative |  |
Liability Derivatives Fair Value | 157.0 | 99.0
Designated as Hedging Instrument | Other Liabilities | Cash Flow Hedging |  |
Derivative |  |
Liability Derivatives Fair Value | 146.0 | 82.3
Designated as Hedging Instrument | Other Liabilities | Forwards | Cash Flow Hedging |  |
Derivative |  |
Liability Derivatives Fair Value | 143.7 | 77.8
Designated as Hedging Instrument | Other Liabilities | Interest Rate Swaps | Cash Flow Hedging |  |
Derivative |  |
Liability Derivatives Fair Value | 2.3 | 4.5
Designated as Hedging Instrument | Other Liabilities | Interest Rate Swaps | Fair Value Hedging |  |
Derivative |  |
Liability Derivatives Fair Value | 11.0 | 16.7
Not Designated as Hedging Instrument |  |
Derivative |  |
Derivative, Notional Amount | 302.7 | 286.7
Not Designated as Hedging Instrument | Forwards |  |
Derivative |  |
Derivative, Notional Amount | 54.6 | 52.5
Not Designated as Hedging Instrument | Interest Rate Swaps |  |
Derivative |  |
Derivative, Notional Amount | 132.0 | 132.0
Not Designated as Hedging Instrument | Total Return Swap |  |
Derivative |  |
Derivative, Notional Amount | 116.1 | 102.2
Not Designated as Hedging Instrument | Embedded Derivative in Modified Coinsurance Arrangement |  |
Derivative |  |
Derivative, Notional Amount | 0.0 | 0.0
Not Designated as Hedging Instrument | Other Long-term Investments |  |
Derivative |  |
Asset Derivatives Fair Value | 8.6 | 3.0
Not Designated as Hedging Instrument | Other Long-term Investments | Forwards |  |
Derivative |  |
Asset Derivatives Fair Value | 3.2 | 3.0
Not Designated as Hedging Instrument | Other Long-term Investments | Interest Rate Swaps |  |
Derivative |  |
Asset Derivatives Fair Value | 0.0 | 0.0
Not Designated as Hedging Instrument | Other Long-term Investments | Total Return Swap |  |
Derivative |  |
Asset Derivatives Fair Value | 0.0 | 0.0
Not Designated as Hedging Instrument | Other Long-term Investments | Embedded Derivative in Modified Coinsurance Arrangement |  |
Derivative |  |
Asset Derivatives Fair Value | 5.4 | 0.0
Not Designated as Hedging Instrument | Other Liabilities |  |
Derivative |  |
Liability Derivatives Fair Value | 16.6 | 18.7
Not Designated as Hedging Instrument | Other Liabilities | Forwards |  |
Derivative |  |
Liability Derivatives Fair Value | 0.0 | 0.2
Not Designated as Hedging Instrument | Other Liabilities | Interest Rate Swaps |  |
Derivative |  |
Liability Derivatives Fair Value | 16.6 | 17.0
Not Designated as Hedging Instrument | Other Liabilities | Total Return Swap |  |
Derivative |  |
Liability Derivatives Fair Value | 0.0 | 0.0
Not Designated as Hedging Instrument | Other Liabilities | Embedded Derivative in Modified Coinsurance Arrangement |  |
Derivative |  |
Liability Derivatives Fair Value | $ 0.0 | $ 1.5

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