Income Tax (Details Textuals) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Taxes (Textuals) [Abstract]
Possible decrease in unrecognized tax benefits as a result of potential resolutions of prior years' tax	$ 6.0		$ 6.0
Effective tax rate	12.30%	28.90%	11.50%	15.80%
U.S. statutory federal income tax rate			35.00%
Out of period tax adjustment		$ 16.7		$ 11.0
Internal Revenue Service (IRS) [Member] | Earliest Year [Member]
Income Tax Contingency [Line Items]
Open tax years by major tax jurisdiction			2008
Internal Revenue Service (IRS) [Member] | Latest Year [Member]
Income Tax Contingency [Line Items]
Open tax years by major tax jurisdiction			2014