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