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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
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Derivative Instruments, Gain (Loss) |  |
Net Investment Income | $ 508.8 | $ 527.2
Net Investment Gain (Loss) | 0.1 | (13.8)
Interest and Debt Expense | 48.1 | 46.9
Derivative, Gain (Loss) on Derivative, Net | 0.6 | (1.8)
Designated as Hedging Instrument | Interest Rate Swaps | Net Investment Income | Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Investment Income | 49.5 | 50.4
Derivative, Gain (Loss) on Derivative, Net | 10.4 | 13.4
Designated as Hedging Instrument | Interest Rate Swaps | Net Investment Gain (Loss) | Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Investment Gain (Loss) | 0.0 | 0.0
Derivative, Gain (Loss) on Derivative, Net | 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 | 0.7 | 0.7
Derivative, Gain (Loss) on Derivative, Net | 0.0 | 0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Income | Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Investment Income | 2.5 | 2.8
Derivative, Gain (Loss) on Derivative, Net | 0.3 | 0.2
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Income | Fair Value Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Investment Income | 3.2 | 2.7
Derivative, Gain (Loss) on Derivative, Net | 1.3 | 1.4
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Gain (Loss) | Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Investment Gain (Loss) | 0.0 | 0.0
Derivative, Gain (Loss) on Derivative, Net | 0.0 | 0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Gain (Loss) | Fair Value Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Investment Gain (Loss) | 3.2 | (5.3)
Derivative, Gain (Loss) on Derivative, Net | (3.2) | 5.3
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
Derivative, Gain (Loss) on Derivative, Net | 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
Derivative, Gain (Loss) on Derivative, Net | 0.0 | 0.0
Designated as Hedging Instrument | Forwards | Net Investment Income | Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Investment Income | 0.7 | 0.0
Derivative, Gain (Loss) on Derivative, Net | 0.0 | 0.0
Designated as Hedging Instrument | Forwards | Net Investment Gain (Loss) | Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Net Investment Gain (Loss) | 0.0 | 0.0
Derivative, Gain (Loss) on Derivative, Net | 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
Derivative, Gain (Loss) on Derivative, Net | $ 0.0 | $ 0.0

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