Revenues Contract Balances (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Trade Receivables, net	$ 106.5		$ 139.2
Contract Liability Beginning Balance	9.2	$ 1.9
Contracts with Customers, Asset, Gross, Current	0.0		$ 0.0
Cumulative effect adjustment from the implementation of ASC 606		6.4
Revenues recognized that were included in the contract liability balance at the beginning of the period	(0.8)	(1.2)
Increases due to cash received, excluding amounts recognized as revenues during the period	2.5	2.2
Contract Liability Ending Balance	$ 10.9	$ 9.3