Supplemental Financial Statement Information - Narrative (Details) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2021 USD ($) employee	Sep. 30, 2020 USD ($) employee	Jun. 30, 2020 employee	Mar. 31, 2020 employee	Sep. 30, 2021 USD ($) employee	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	$ (2.3)	$ 2.3			$ (8.5)	$ 27.0
Number of positions with decreased severance-related reserve | employee	50				250
Number of positions eliminated | employee		100	550	90
Restructuring reserve	$ 21.8				$ 21.8		$ 43.4
Facility Idling
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)					0.7
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)					(9.2)
Other Current Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	13.4				13.4
Other Noncurrent Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 8.4				$ 8.4