Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ 2,104.9	$ 2,126.9	$ 2,187.7	$ 2,234.1
Gain on interest rate swap, net of income taxes of $0.4 on both dates
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	0.7	0.8
Defined benefit pension plans, net of income tax benefit of $0 and $(20.1), respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(9.9)	(8.9)
Retiree health care plan, net of income taxes of $0 and $2.0, respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	1.3	1.5
Foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(303.2)	(342.2)
Translation loss on long-term intercompany loans, net of income taxes of $19.1 on both dates
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(133.6)	(133.2)
Gain (Loss) on derivative instruments, net of income tax benefit of $0 and $(4.8), respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(2.4)	39.0
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (447.1)	$ (443.0)	$ (495.5)	$ (466.0)