Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jan. 01, 2017
Excluding discrete items [Line Items]
Unrecognized Tax Benefits		$ 13.0				$ 39.1
Provision (benefit) for income taxes	$ (8.1)		$ 21.5	$ 7.4	$ 50.6
Effective Income Tax Rate Reconciliation, Percent	(11.00%)		30.80%	5.80%	30.70%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				35.00%
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		1.5
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		(1.3)		$ (34.0)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations		$ (26.3)
excluding discrete items [Member]
Excluding discrete items [Line Items]
Effective Income Tax Rate Reconciliation, Percent			30.80%