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Derivative Financial Instruments Location of Gains and Losses Designated as Hedging Instruments, Consolidated Statements of Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Derivative Instruments, Gain (Loss) |  |  |
Net Investment Income | $ 2,032.7 | $ 2,130.0 | $ 2,096.7
Net Investment Loss | (106.6) | (34.6) | (36.0)
Interest and Debt Expense | 208.8 | 201.1 | 194.8
Derivative, Gain (Loss) on Derivative, Net | 2.9 | (3.8) | 0.6
Designated as Hedging Instrument | Interest Rate Swaps | Net Investment Income | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Net Investment Income | 58.6 | 109.6 | 198.6
Derivative, Gain (Loss) on Derivative, Net | 8.4 | 17.4 | 35.2
Designated as Hedging Instrument | Interest Rate Swaps | Net Realized Investment Gain (Loss) | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Net Investment Loss | 37.7 | 0.0 | 0.8
Derivative, Gain (Loss) on Derivative, Net | 2.2 | 0.0 | 0.0
Designated as Hedging Instrument | Interest Rate Swaps | Interest and Debt Expense | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Interest and Debt Expense | 2.9 | 2.9 | 2.9
Derivative, Gain (Loss) on Derivative, Net | 0.2 | 0.0 | 0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Income | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Net Investment Income | 7.8 | 8.6 | 9.6
Derivative, Gain (Loss) on Derivative, Net | 0.6 | 0.7 | 0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Income | Fair Value Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Net Investment Income | 21.5 | 17.1 | 14.5
Derivative, Gain (Loss) on Derivative, Net | 0.8 | 14.5 | 11.1
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Realized Investment Gain (Loss) | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Net Investment Loss | (2.1) | (0.4) | 0.4
Derivative, Gain (Loss) on Derivative, Net | 2.5 | 0.4 | (0.4)
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Realized Investment Gain (Loss) | Fair Value Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Net Investment Loss | 71.0 | (40.2) | 18.7
Derivative, Gain (Loss) on Derivative, Net | (71.0) | 40.2 | (18.7)
Designated as Hedging Instrument | Foreign Exchange Contracts | Interest and Debt Expense | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Interest and Debt Expense | 0.0 | 0.0 | 0.0
Derivative, Gain (Loss) on Derivative, Net | 0.0 | 0.0 | 0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Interest and Debt Expense | Fair Value Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Interest and Debt Expense | 0.0 | 0.0 | 0.0
Derivative, Gain (Loss) on Derivative, Net | 0.0 | 0.0 | 0.0
Designated as Hedging Instrument | Forwards | Net Investment Income | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Net Investment Income | 56.2 | 40.7 | 18.5
Derivative, Gain (Loss) on Derivative, Net | (1.7) | (1.0) | (0.5)
Designated as Hedging Instrument | Forwards | Net Realized Investment Gain (Loss) | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Net Investment Loss | 0.5 | 0.0 | 0.0
Derivative, Gain (Loss) on Derivative, Net | (3.1) | 0.0 | 0.0
Designated as Hedging Instrument | Forwards | Interest and Debt Expense | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Interest and Debt Expense | 0.0 | 0.0 | 0.0
Derivative, Gain (Loss) on Derivative, Net | $ 0.0 | $ 0.0 | $ 0.0

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