Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 8.3	$ 12.8
Operating cash flows for finance leases	0.7	0.2
Financing cash flows for finance leases	1.3	5.8
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	3.1	1.3
Finance leases	$ 3.6	$ 0.1