Commitments and Contingencies Other (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Provision for employee separation expense [Abstract]
Accrued Liabilities		$ 0.8
Severance Costs	$ 0.2	$ 1.1	$ 1.4