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Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Parenthetical) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Translation gain on derivative instruments, net of income taxes of $(9.0) and $(9.1), respectively |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, income taxes | $ (9.0) | $ (9.1)
Defined benefit pension plans and Retiree health care plan | Defined benefit pension plans, net of income taxes of $(35.2) and $(30.9), respectively |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, income taxes | (35.2) | (30.9)
Defined benefit pension plans and Retiree health care plan | Retiree health care plan, net of income taxes of $2.2 and $1.6, respectively |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, income taxes | $ 2.2 | $ 1.6

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