Leases - Schedule of Lease Cost and Related Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease expense	$ 52.6	$ 152.9
Variable lease expense	8.4	22.8
Operating cash flows from operating leases	52.2	151.8
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 41.3	$ 165.2