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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Income | $ 531.1 | $ 559.0 | $ 1,039.9 | $ 1,086.2
Net Investment Gain (Loss) | 0.9 | (4.1) | 1.0 | (17.9)
Interest and Debt Expense | 48.9 | 47.4 | 97.0 | 94.3
Derivative, Gain (Loss) on Derivative, Net | (0.6) | (3.7) | 0.0 | (5.5)
Designated as Hedging Instrument | Interest Rate Swaps | Net Investment Income | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Income | 49.0 | 50.3 | 98.5 | 100.7
Derivative, Gain (Loss) on Derivative, Net | 9.0 | 13.0 | 19.4 | 26.4
Designated as Hedging Instrument | Interest Rate Swaps | Net Investment Gain (Loss) | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Gain (Loss) | 0.8 | 0.0 | 0.8 | 0.0
Derivative, Gain (Loss) on Derivative, Net | 0.0 | 0.0 | 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 | 0.8 | 0.7 | 1.5 | 1.4
Derivative, Gain (Loss) on Derivative, Net | 0.0 | 0.0 | 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 | 5.0 | 5.6
Derivative, Gain (Loss) on Derivative, Net | (0.1) | 0.4 | 0.2 | 0.6
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Income | Fair Value Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Income | 3.2 | 3.1 | 6.4 | 5.8
Derivative, Gain (Loss) on Derivative, Net | 2.3 | 2.7 | 3.6 | 4.1
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 | 0.0 | 0.0
Derivative, Gain (Loss) on Derivative, Net | 0.1 | 0.0 | 0.1 | 0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Net Investment Gain (Loss) | Fair Value Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Gain (Loss) | 3.3 | (27.6) | 6.5 | (32.9)
Derivative, Gain (Loss) on Derivative, Net | (3.3) | 27.6 | (6.5) | 32.9
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
Derivative, Gain (Loss) on Derivative, Net | 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
Derivative, Gain (Loss) on Derivative, Net | 0.0 | 0.0 | 0.0 | 0.0
Designated as Hedging Instrument | Forwards | Net Investment Income | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) |  |  |  |
Net Investment Income | 3.1 | 0.0 | 3.8 | 0.0
Derivative, Gain (Loss) on Derivative, Net | 0.0 | 0.0 | 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 | 0.0 | 0.0
Derivative, Gain (Loss) on Derivative, Net | 0.0 | 0.0 | 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 | 0.0
Derivative, Gain (Loss) on Derivative, Net | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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