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Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Translation gain on derivative instruments, net of income taxes of $(3.6) and $(9.1), respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, income taxes	$ (3.7)	$ (9.1)
Defined benefit pension plans and Retiree health care plan | Defined benefit pension plans, net of income taxes of $(35.4) and $(30.9), respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, income taxes	(35.4)	(30.9)
Defined benefit pension plans and Retiree health care plan | Retiree health care plan, net of income taxes of $2.3 and $1.6, respectively
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, income taxes	$ 2.3	$ 1.6

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Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) including portion attributable to noncontrolling interest.

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