Leases - Components of Lease Expense and Other Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease expense	$ 35.5	$ 36.0
Short-term lease expense	1.5	3.9
Variable lease expense	4.9	4.3
Total lease expense	41.9	44.2
Supplemental Cash Flow Information
Cash paid for amounts included in the measurement of operating lease liabilities	34.7	36.0
Operating ROU assets obtained in exchange for lease obligations	$ 11.0	$ 15.3