Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	$ 2,453.6	$ 2,761.5	$ 2,698.5	$ 2,857.6
Foreign currency translation
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	(72.1)	(260.5)
Translation (loss) gain on derivative instruments, net of income taxes of $(34.9) and $(9.1), respectively
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	(81.2)	13.1
Translation loss on long-term intercompany loans
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	(133.3)	(121.5)
Defined benefit pension plans and Retiree health care plan | Defined benefit pension plans, net of income taxes of $(37.9) and $(30.9), respectively
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	(111.4)	(74.1)
Defined benefit pension plans and Retiree health care plan | Retiree health care plan, net of income taxes of $0.7 and $1.6, respectively
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	0.7	2.0
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	$ (397.3)	$ (441.0)	$ (399.8)	$ (288.2)