Restructuring Charges - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges (benefits)	$ 21.6	$ 4.8	$ 40.9	$ 13.7
2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges (benefits)			40.9
2020 Restructuring Plan | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges (benefits)	(0.9)		13.8
2020 Restructuring Plan | Facility consolidations
Restructuring Cost and Reserve [Line Items]
Restructuring charges (benefits)	2.3		6.9
2020 Restructuring Plan | Contract terminations and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges (benefits)	20.2		$ 20.2
2020 Restructuring Plan | Restructuring impairment charge
Restructuring Cost and Reserve [Line Items]
Restructuring charges (benefits)	$ 5.3