Income Taxes (Unrecognized) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of unrecognized tax benefits
Unrecognized Tax Benefits, Beginning Balance	$ 1.5	$ 2.0
Unrecognized tax positions assumed in merger			$ 3.8
Decrease due to prior year tax positions	(1.5)	(0.5)	(2.0)
Increases due to current year tax positions			0.2
Unrecognized Tax Benefits, Ending Balance		$ 1.5	$ 2.0
Federal
Income tax
Operating Loss Carryforwards	170.1
State and Local
Income tax
Operating Loss Carryforwards	$ 123.0