Leases - Schedule of Lease Cost and Related Cash Flow 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	$ 43.8	$ 42.2	$ 130.2	$ 121.4
Variable lease expense	6.6	5.6	19.0	17.8
Operating cash flows from operating leases	43.8	41.8	129.8	120.0
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 30.5	$ 35.4	$ 98.0	$ 132.3