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Shareholders' Equity - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total shareholders' equity | $ 2,716.1 | $ 2,694.5 | $ 2,649.9 | $ 2,698.5 | $ 2,810.2 | $ 2,847.5 | $ 2,939.0 | $ 2,857.6
Foreign currency translation |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total shareholders' equity | (323.3) |  |  | (223.2) |  |  |  |
Translation gain (loss) on derivative instruments, net of income taxes of $(10.9) and $(12.9), respectively |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total shareholders' equity | 38.5 |  |  | (4.7) |  |  |  |
Translation loss on long-term intercompany loans |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total shareholders' equity | (133.6) |  |  | (137.2) |  |  |  |
Defined benefit pension plans and Retiree health care plan | Defined benefit pension plans, net of income taxes of $(23.0) and $(23.2), respectively |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total shareholders' equity | (36.9) |  |  | (37.9) |  |  |  |
Defined benefit pension plans and Retiree health care plan | Retiree health care plan, net of income taxes of $1.9 and $2.0 for 2019 and 2018, respectively |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total shareholders' equity | 2.8 |  |  | 3.2 |  |  |  |
Accumulated other comprehensive loss |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total shareholders' equity | $ (452.5) | $ (416.5) | $ (401.8) | $ (399.8) | $ (393.2) | $ (375.9) | $ (264.1) | $ (288.2)

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