Income Taxes (Details Textual) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) subsidiaries	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Income Tax Contingency [Line Items]
Additions for tax positions related to the current year			$ 2.7	$ 2.6
Reductions for tax positions of prior years			0.1	0.1
Unrecognized tax benefits including interest and penalties that would affect the Company's effective tax rate if recognized	$ 15.3	$ 14.0	15.3	14.0
Total accrued interest and penalties	12.1		12.1		$ 11.6
Increase in income tax expense related to interest and penalties on unrecognized tax benefits	$ 0.3	$ 0.2	$ 0.5	$ 0.4
Swiss subsidiary
Income Tax Contingency [Line Items]
Number of subsidiaries | subsidiaries			2
General period of statute of limitations in Switzerland			5 years
Extended period of statute of limitations in Switzerland			15 years