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Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ 2,377.4 | $ 2,453.6 | $ 2,639.0 | $ 2,761.5
Foreign currency translation |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | (168.6) | (72.1) |  |
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 | (31.6) | (81.2) |  |
Translation loss on long-term intercompany loans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | (127.7) | (133.3) |  |
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 | (110.4) | (111.4) |  |
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 | 0.5 | 0.7 |  |
Accumulated other comprehensive loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ (437.8) | $ (397.3) | $ (505.8) | $ (441.0)

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. 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