Leases - Supplemental Cash Flow Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating Cash Flows from Operating Lease (Fixed Payments)	$ 10.6
Operating Cash Flows from Operating Lease (Liability Reduction)	9.3
Financing Cash Flows from Finance Leases	0.3
Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities	$ 9.5