Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from finance leases	$ 3.9	$ 3.8
Operating cash flows from operating leases	108.2	90.6
Financing cash flows from finance leases	$ 1.6	$ 1.6