Income Tax (Details Textuals) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Taxes (Textuals) [Abstract]
Possible decrease in unrecognized tax benefits as a result of potential resolutions of prior years' tax	$ 287.0		$ 287.0
Unrecognized tax benefits, amounts recorded to equity, if recognized	$ 285.0		$ 285.0
Effective tax rate	28.90%	(12.50%)	15.80%	(8.60%)
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			2011