Property and Equipment - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property, software and equipment depreciation, amortization expense	$ 436.3	$ 402.1	$ 401.2
Capitalization of stock-based compensation	38.0	35.9	$ 34.8
Disposal of property plant and equipment	279.9	166.7
Write off of internal-use software	$ 0.8	$ 3.8