Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating Cash Flows from Operating Leases (Fixed Payments)	$ 15.8	$ 20.0
Operating Cash Flows from Operating Leases (Liability Reduction)	17.5	17.6
Financing Cash Flows from Finance Leases	0.3	0.7
Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities	$ 11.0	$ 25.9