Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2021
Leases [Abstract]
Operating Cash Flows from Operating Lease (Fixed Payments)	$ 10.9	$ 11.4
Operating Cash Flows from Operating Lease (Liability Reduction)	9.5	10.2
Financing Cash Flows from Finance Leases	0.2	0.1
Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities	$ 5.8	$ 18.2