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