Leases - Components of Lease Expense and Other Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease expense	$ 35.6	$ 35.0	$ 71.6	$ 69.7
Short-term lease expense	3.3	6.0	7.2	12.1
Variable lease expense	4.2	4.8	8.5	9.9
Total lease expense	$ 43.1	$ 45.8	87.3	91.7
Supplemental Cash Flow Information
Cash paid for amounts included in the measurement of operating lease liabilities			71.6	64.8
Operating ROU assets obtained in exchange for lease obligations			$ 26.0	$ 69.7