Leases - Components of Lease Expense and Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease expense	$ 143.1	$ 153.5
Short-term lease expense	11.3	17.6
Variable lease expense	16.7	15.8
Total lease expense	171.1	186.9
Supplemental Cash Flow Information
Cash paid for amounts included in the measurement of operating lease liabilities	142.0	150.1
Operating ROU assets obtained in exchange for lease obligations	$ 63.6	$ 129.3