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Derivative Financial Instruments Location of Gains and Losses Designated as Hedging Instruments, Consolidated Statements of Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Income | $ 476.8 | $ 527.8 | $ 1,550.7 | $ 1,586.4
Net Investment Gain (Loss) | 128.0 | (12.9) | (96.5) | (24.5)
Interest and Debt Expense | 52.2 | 49.2 | 156.2 | 148.6
Net Gain (Loss) on Derivatives | 0.1 | (2.2) | (3.1) | (0.2)
Designated as Hedging Instrument | Interest Rate Swaps | Net Investment Income | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Income | 11.8 | 21.1 | 46.8 | 91.3
Net Gain (Loss) on Derivatives | 1.5 | 3.7 | 7.0 | 14.5
Designated as Hedging Instrument | Interest Rate Swaps | Net Investment Gain (Loss) | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Gain (Loss) | 39.2 | 0.0 | 38.9 | 0.0
Net Gain (Loss) on Derivatives | 2.2 | 0.0 | 2.2 | 0.0
Designated as Hedging Instrument | Interest Rate Swaps | Interest and Debt Expense | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Interest and Debt Expense | 0.7 | 0.7 | 2.2 | 2.2
Net Gain (Loss) on Derivatives | 0.1 | 0.0 | 0.1 | 0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Income | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Income | 1.6 | 2.3 | 5.9 | 6.5
Net Gain (Loss) on Derivatives | (0.9) | 0.9 | (1.3) | 0.5
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Income | Fair Value Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Income | 6.1 | 4.9 | 15.7 | 13.4
Net Gain (Loss) on Derivatives | 3.7 | 4.2 | 1.4 | 11.5
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Gain (Loss) | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Gain (Loss) | (0.9) | (0.7) | (1.0) | (0.4)
Net Gain (Loss) on Derivatives | 0.8 | 0.7 | 0.9 | 0.5
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Gain (Loss) | Fair Value Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Gain (Loss) | (2.3) | 25.2 | 69.8 | 5.6
Net Gain (Loss) on Derivatives | 2.3 | (25.2) | (69.8) | (5.6)
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 | 0.0
Net Gain (Loss) on Derivatives | 0.0 | 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 | 0.0
Net Gain (Loss) on Derivatives | 0.0 | 0.0 | 0.0 | 0.0
Designated as Hedging Instrument | Forward Benchmark Interest Rate Lock | Net Investment Income | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Income | 14.6 | 10.7 | 40.5 | 29.6
Net Gain (Loss) on Derivatives | (0.4) | (0.3) | (1.2) | (0.7)
Designated as Hedging Instrument | Forward Benchmark Interest Rate Lock | Net Investment Gain (Loss) | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Gain (Loss) | 0.5 | 0.0 | 0.5 | 0.0
Net Gain (Loss) on Derivatives | (3.1) | 0.0 | (3.1) | 0.0
Designated as Hedging Instrument | Forward Benchmark Interest Rate Lock | Interest and Debt Expense | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Interest and Debt Expense | 0.0 | 0.0 | 0.0 | 0.0
Net Gain (Loss) on Derivatives | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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