Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Continuing Operations, Excluding Tax Cuts and Jobs Act				33.70%
Tax Cuts and Jobs Act of 2017, change in tax rate, income tax expense (benefit)				$ 371.4
Effective Income Tax Rate Reconciliation, Percent				(113.70%)	31.30%	41.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	$ 7.1			$ 0.0	$ 7.8	$ 0.0
State deferred tax rate change impact				5.0	0.0	14.1
Provision for Income Taxes, Equity Method Investment				(12.0)	(5.7)	$ 0.5
Amount of U.S. federal tax net operating loss	4.1			4.1
Alternative minimum tax credit	8.0			8.0	8.0
State net operating loss	29.5			29.5	25.4
State net operating loss carryforwards valuation allowance	10.3			10.3	12.9
Foreign net operating loss	2.1			2.1	2.9
Unrecognized Tax Benefits	4.3			4.3
Decrease in income tax expenses unrecognized tax benefits if recognized	0.0			0.0	2.8
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities			$ 1.4
Tax Cuts and Jobs Act of 2017, transition tax for accumulated roreign earnings, income tax expense (benefit)				57.2
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax liability, income tax (expense) Benefit				5.0
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Equity Method Investment, Summarized Financial Information, Income Tax		$ 3.9		3.9	$ 7.7
Amount of U.S. federal tax net operating loss	$ 1.7			$ 1.7
Maximum [Member] | Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Percent				38.30%
Minimum [Member] | Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Percent				25.10%