Leases - Components of Lease Expense and Other Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease expense	$ 37.4	$ 36.4	$ 109.0	$ 106.1
Short-term lease expense	1.8	3.5	9.0	15.6
Variable lease expense	3.9	2.6	12.4	12.5
Total lease expense	$ 43.1	$ 42.5	130.4	134.2
Supplemental Cash Flow Information
Cash paid for amounts included in the measurement of operating lease liabilities			107.9	109.7
Operating ROU assets obtained in exchange for lease obligations			$ 56.1	$ 88.8