Restructuring Charge - Narrative (Details) $ in Millions	1 Months Ended		12 Months Ended
	Feb. 07, 2019 USD ($)		Dec. 31, 2020 USD ($) employee	Dec. 31, 2019 USD ($) employee		Dec. 31, 2018 USD ($) employee
Restructuring and Related Activities [Abstract]
Restructuring charges	$ 0.1	[1]	$ 34.8	$ 51.8	[1]	$ 25.4
Severance costs	$ 0.1		$ 9.9	$ 36.6		$ 22.3
Number of employees impacted | employee			165	540		390
Contract termination, write-down of right-of-use assets and other exit costs			$ 24.9	$ 15.2		$ 3.1

[1] See Note 1 "Basis of Presentation" for further discussion.