Leases - Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash Paid for Amounts Included in the Measurement of Lease Liabilities
Operating cash flows from operating leases	$ 60.2	$ 20.3
Operating cash flows from finance leases	1.1	1.6
Financing cash flows from finance leases	0.7	0.9
Leased Assets Obtained in Exchange for New Operating Lease Liabilities(1)	$ 171.6	$ 8.0