Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Supplemental cash flow information related to leases
Operating cash flows from finance leases	$ 0.1
Operating cash flows from operating leases	24.0	$ 27.1
Financing cash flows from finance leases	0.9	0.4
Right-of-use assets obtained in exchange for lease liabilities
Operating leases	24.3	19.8
Finance leases	$ 2.6	$ 1.2