Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ 2,011.4	$ 1,995.2	$ 2,104.9	$ 2,126.9	$ 2,177.7	$ 2,145.9	$ 2,187.7	$ 2,234.1
Gain on interest rate swap, net of income taxes of $0.2 on both dates
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	0.5			0.8
Defined benefit pension plans, net of income tax benefit of $(20.6) on both dates
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(8.8)			(8.9)
Retiree health care plan, net of income taxes of $ 2.0 and $2.1, respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	0.9			1.5
Foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(264.7)			(342.2)
Translation loss on long-term intercompany loans, net of income taxes of $19.2 and $19.1, respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(133.7)			(133.2)
(Loss) gain on derivative instruments, net of income tax benefit of $(44.9) and $(0.7), respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(51.3)			39.0
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (457.1)	$ (450.9)	$ (447.1)	$ (443.0)	$ (469.9)	$ (500.4)	$ (495.5)	$ (466.0)