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Pension Plans (Components of Net Periodic Pension Cost) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Retirement Benefits [Abstract] |  |  |  |
Defined Benefit Plan, Type [Extensible List] | us-gaap:PensionPlansDefinedBenefitMember | us-gaap:PensionPlansDefinedBenefitMember | us-gaap:PensionPlansDefinedBenefitMember | us-gaap:PensionPlansDefinedBenefitMember
Interest cost | $ 5.1 | $ 5.5 | $ 15.3 | $ 16.4
Expected return on plan assets | (5.1) | (5.5) | (15.2) | (16.5)
Recognized net actuarial loss | 1.7 | 1.9 | 5.0 | 5.8
Net periodic pension cost | $ 1.7 | $ 1.9 | $ 5.1 | $ 5.7

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