Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Parenthetical) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
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, income taxes	$ 19.1	$ 19.1
Gain (Loss) on derivative instruments, net of income tax benefit of $(9.7) and $(22.7), respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, income taxes	(9.7)	(22.7)
Gain on interest rate swap, net of income taxes of $0.3 on both dates
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, income taxes	0.3	0.3
Defined benefit pension plans, net of income tax benefit of $(22.6) and $(23.0), respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, income taxes	(22.6)	(23.0)
Retiree health care plan, net of income taxes of $1.9 and $2.0, respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, income taxes	$ 1.9	$ 2.0