Reorganization and Restructuring - Narrative (Details) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) position	Dec. 31, 2017 USD ($)
Reorganization and Restructuring 2016
Restructuring Cost and Reserve [Line Items]
Cumulative pretax charges						$ 48.0
Positions eliminated across the global workforce | position						800
Restructuring Reserve [Roll Forward]
Expense (benefit)			$ 18.1			$ 13.0	$ 17.3
Other Restructurings
Restructuring Cost and Reserve [Line Items]
Restructuring costs					$ 28.8
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance				$ 7.0	3.3
Expense (benefit)				73.3	29.2	7.6
Payments and utilization				(64.5)	(25.1)
Accrual adjustment				(6.1)	(0.4)
Foreign currency exchange effects				(0.4)	0.0
Restructuring Reserve, ending balance	$ 9.3			9.3	7.0	3.3
Severance Costs | Other Restructurings
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance				7.0	3.3
Expense (benefit)				66.5	19.7
Payments and utilization				(57.7)	(15.6)
Accrual adjustment				(6.1)	(0.4)
Foreign currency exchange effects				(0.4)	0.0
Restructuring Reserve, ending balance	9.3			9.3	7.0	3.3
Severance Costs | Other Restructurings | Operating Income (Loss)
Restructuring Cost and Reserve [Line Items]
Restructuring costs	16.9	$ 39.0		66.6
Severance Costs | Other Restructurings | Nonoperating Income (Expense)
Restructuring Cost and Reserve [Line Items]
Restructuring costs				0.6
Modification of Share-based Awards | Other Restructurings
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance				0.0	0.0
Expense (benefit)				0.0	7.7
Payments and utilization				0.0	(7.7)
Accrual adjustment				0.0	0.0
Foreign currency exchange effects				0.0	0.0
Restructuring Reserve, ending balance	0.0			0.0	0.0	0.0
Other Restructuring | Other Restructurings
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance				0.0	0.0
Expense (benefit)				6.8	1.8
Payments and utilization				(6.8)	(1.8)
Accrual adjustment				0.0	0.0
Foreign currency exchange effects				0.0	0.0
Restructuring Reserve, ending balance	0.0			0.0	$ 0.0	$ 0.0
Minimum | Other Restructurings
Restructuring Cost and Reserve [Line Items]
Expected costs	4.0			4.0
Maximum | Other Restructurings
Restructuring Cost and Reserve [Line Items]
Expected costs	$ 6.0			$ 6.0