Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating Cash Flows from Operating Lease (Fixed Payments)	$ 5.3	$ 5.2
Operating Cash Flows from Operating Lease (Liability Reduction)	4.7	4.7
Financing Cash Flows from Finance Leases	0.1	0.2
Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities	$ 11.3	$ 9.1