Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating Lease, Payments	$ 19.4	$ 41.3
Finance Lease, Principal Payments	0.1	0.2
Finance Lease, Interest Payment on Liability	0.1	0.2
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	26.1	40.8
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 0.1	$ 2.1