Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Equity Method Investment, Summarized Financial Information, Income Tax				$ 7.8	$ 15.4
Effective Income Tax Rate Reconciliation, Percent				31.30%	41.00%	32.70%
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	$ 7.1			$ 7.8	$ 0.0	$ 0.0
State deferred tax rate change impact			$ 14.1	0.0	14.1	0.0
Provision for Income Taxes, Equity Method Investment				(5.7)	0.5	(18.3)
Cumulative amount of undistributed earning of foreign subsidiaries	961.1			961.1
Alternative minimum tax credit	8.0		14.8	8.0	14.8
Foreign tax credit	0.0		5.8	0.0	5.8
Foreign tax credits valuation allowance	0.0		5.8	0.0	5.8
State net operating loss	25.4		27.7	25.4	27.7
State net operating loss carryforwards valuation allowance	12.9		12.6	12.9	12.6
Foreign net operating loss	2.9		3.6	2.9	3.6
Unrecognized Tax Benefits	4.3		5.7	4.3	5.7	$ 5.6
Decrease in income tax expenses unrecognized tax benefits if recognized	2.8		3.8	2.8	3.8
Reductions due to expiration of the applicable statute of limitations				1.4	0.0
Increase due to settlement with taxing authorities				0.0	0.1
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Equity Method Investment, Summarized Financial Information, Income Tax		$ 3.9	$ 7.7	3.9	$ 7.7
Amount of U.S. federal tax net operating loss	$ 2.6			$ 2.6