Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Tax Contingency [Line Items]
Tax benefit from reversal of valuation allowance on foreign tax credits		$ 6.4
Adjustment to net deferred tax liability for state tax filing responsibilities		5.1
Additions for tax positions related to the current year			3.7	3.4
Additions for tax positions of prior years			0.3	1.9
Reductions for tax positions of prior years			0.1	0
Unrecognized tax benefits including interest and penalties that would affect the Company's effective tax rate if recognized	14.2	13.9	14.2	13.9
Total accrued interest and penalties	11.4		11.4		10.8
Increase in income tax expense related to interest and penalties on unrecognized tax benefits	$ 0.2	$ 0.2	$ 0.6	$ 0.7
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