Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Parenthetical) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
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, income taxes	$ 19.2	$ 19.1
(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, income taxes	(21.3)	(0.7)
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, income taxes	0.2	0.2
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, income taxes	(20.5)	(20.6)
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, income taxes	$ 1.9	$ 2.1