Leases - Components of Lease Expense and Other Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating lease expense	$ 34.9	$ 35.6	$ 70.4	$ 71.6
Short-term lease expense	1.6	3.3	3.1	7.2
Variable lease expense	4.1	4.2	9.0	8.5
Total lease expense	$ 40.6	$ 43.1	82.5	87.3
Supplemental Cash Flow Information
Cash paid for amounts included in the measurement of operating lease liabilities			69.6	71.6
Operating ROU assets obtained in exchange for lease obligations			$ 15.2	$ 26.0