Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Parenthetical) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Defined benefit pension plans, net of income tax benefit of $(22.4) and $(22.8), respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, income taxes	$ (22.4)	$ (22.8)
Retiree health care plan, net of income taxes of $1.5 and 1.6, respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, income taxes	1.5	1.6
Translation gain (loss) on derivative instruments, net of income taxes (benefit) of $4.3 and $(16.4), respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, income taxes	$ 4.3	$ (16.4)