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Restructuring - Schedule of Severance and Other Restructuring Accrual Activity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2017			$ 37.4
Restructuring (credits) charges	$ (1.2)	$ 2.6	2.7	$ 12.7
Payments and other			(24.1)
Balance as of September 30, 2018	16.0		16.0
Severance Pay and Benefits
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2017			26.3
Restructuring (credits) charges			(4.1)
Payments and other			(18.0)
Balance as of September 30, 2018	4.2		4.2
Contract Termination and Other Costs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2017			11.1
Restructuring (credits) charges			6.8
Payments and other			(6.1)
Balance as of September 30, 2018	$ 11.8		$ 11.8