Leases Cash Flows of Operating and Finance Leases (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Operating Lease, Payments	$ 11.6
Finance Lease, Interest Payment on Liability	0.4
Finance Lease, Principal Payments	3.7
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	8.7
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 1.6