Pension Plans (Components of Net Periodic Pension (Benefit) Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Retirement Benefits [Abstract]
Defined Benefit Plan, Type [Extensible List]	us-gaap:PensionPlansDefinedBenefitMember	us-gaap:PensionPlansDefinedBenefitMember	us-gaap:PensionPlansDefinedBenefitMember
Interest cost	$ 21.9	$ 15.3	$ 14.9
Expected return on plan assets	$ (22.1)	$ (17.2)	$ (18.4)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Cost and Expense, Operating	Other Cost and Expense, Operating	Other Cost and Expense, Operating
Recognized net actuarial loss	$ 7.8	$ 5.2	$ 3.2
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Cost and Expense, Operating	Other Cost and Expense, Operating	Other Cost and Expense, Operating
Net periodic pension (benefit) cost	$ 7.6	$ 3.3	$ (0.3)