Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Excluding discrete items [Line Items]
Provision (benefit) for income taxes	$ 30.2	$ (8.1)	$ 58.5	$ 7.4
Effective Income Tax Rate Reconciliation, Percent	24.70%	(11.00%)	25.30%	5.80%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent				35.00%
Tax on Unremitted Foreign Earnings					$ 25.2
Deferred Income Tax Expense (Benefit)			$ 0.1	$ 7.7
The Tax Cut and Jobs Act of 2018 [Member]
Excluding discrete items [Line Items]
Deferred Income Tax Expense (Benefit)					$ 10.1
Restatement Adjustment [Member]
Excluding discrete items [Line Items]
Income Tax Examination, Increase (Decrease) in Liability from Prior Year			$ 2.8