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Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Parenthetical) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Translation loss on derivative instruments, net of income tax benefit of $(20.5) and $(34.9), respectively |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, income taxes | $ (20.5) | $ (34.9)
Defined benefit pension plans and Retiree health care plan | Defined benefit pension plans, net of income tax benefit of $(37.9) and $(38.2), respectively |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, income taxes | (37.9) | (38.2)
Defined benefit pension plans and Retiree health care plan | Retiree health care plan, net of income taxes of $1.8 for both 2021 and 2020 |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, income taxes | $ 1.8 | $ 1.8

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