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Pension and other Postretirement Benefits - Narrative (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Retirement Benefits [Abstract] |  |  |  |
Defined Benefit Plan, Interest Cost | $ 7.9 | $ 5.7 | $ 23.4 | $ 16.8
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (7.9) | (9.7) | (23.4) | (28.8)
Defined Benefit Plan, Amortization of Gain (Loss) | 0.1 | 0.0 | 0.3 | 0.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ (0.1) | $ (4.0) | $ (0.3) | $ (12.1)

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