Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Tax Contingency [Line Items]
Additions for tax positions related to the current year	$ 1.1	$ 1.0
Reductions for tax positions of prior years	0	1.1
Unrecognized tax benefits including interest and penalties that would affect the Company's effective tax rate if recognized	12.1	17.5
Total accrued interest and penalties	10.5		10.3
Increase (decrease) in income tax expense related to interest and penalties on unrecognized tax benefits	0.2	(0.9)
Lapse in Statute of Limitations
Income Tax Contingency [Line Items]
Reasonably possible change to unrecognized tax benefits within twelve months	$ 1.0
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