Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021
Leases [Abstract]
Operating Cash Flows from Operating Lease (Fixed Payments)	$ 14.8	$ 17.5
Operating Cash Flows from Operating Lease (Liability Reduction)	14.0	15.6
Financing Cash Flows from Finance Leases	0.2	0.2
Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities	$ 8.2	$ 19.4