Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Equity Method Investment, Summarized Financial Information, Income Tax	$ 15.4	$ 15.2
Effective Income Tax Rate Reconciliation, Percent	41.00%	32.70%	41.20%
State deferred tax rate change impact	$ 14.1	$ 0.0	$ 0.0
Cumulative amount of undistributed earning of foreign subsidiaries	847.7
Alternative minimum tax credit	14.8	9.2
Foreign tax credit	5.8	3.6
Foreign tax credits valuation allowance	5.8	3.6
State net operating loss	27.7	28.7
State net operating loss carryforwards valuation allowance	12.6	11.3
Foreign net operating loss	3.6	5.8
Unrecognized Tax Benefits	5.7	5.6	5.7
Decrease in income tax expenses unrecognized tax benefits if recognized	3.8	3.6
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0.1	0.3
Reductions due to expiration of the applicable statute of limitations	0.0	0.4
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount		0.2
Tax On Gain Of Affiliate Sale	0.0	$ 0.0	(23.2)
Domestic [Member]
Operating Loss Carryforwards [Line Items]
Amount of U.S. federal tax net operating loss	37.7
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Equity Method Investment, Summarized Financial Information, Income Tax	7.7		$ 7.6
Amount of U.S. federal tax net operating loss	$ 3.3