Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Tax Contingency [Line Items]
Additions for tax positions related to the current year	$ 1.3	$ 1.2
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	15.1	13.8
Total accrued interest and penalties	11.8		11.6
Increase in income tax expense related to interest and penalties on unrecognized tax benefits	$ 0.2	$ 0.1
Swiss subsidiary
Income Tax Contingency [Line Items]
Number of subsidiaries	2
General period of statute of limitations in Switzerland	5 years
Extended period of statute of limitations in Switzerland	15 years