Non Operating Income and Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Income and Expenses [Abstract]
Interest Expense	$ (31.9)	$ (34.3)	$ (35.5)
Interest Costs Capitalized Adjustment	0.8	0.2	0.3
Amortization of Debt Issuance Costs	(1.3)	(1.5)	(1.8)
Interest Income, Other	2.4	1.0	0.6
Interest expense, net	(30.0)	(34.6)	(36.4)
Debt retirement costs	$ (3.1)	$ (0.5)	$ (1.0)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Nonoperating Income (Expense)	$ (33.0)	$ (40.9)	$ (47.7)