Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Income Taxes (Textual) [Abstract]
Period for income tax examination settlement	12 months
Tax benefit primarily related to favorable claims filed	$ 3.5
Additions for tax positions related to the current year	1.0	0.9
Additions for tax positions of prior years		2.6
Reductions for tax positions of prior years	1.1
Unrecognized tax benefits including interest and penalties that would affect the Company's effective tax rate if recognized	17.5	14.8
Amounts subject to a lapse in statute	5.6
Amounts expected to settle	26.0
Total accrued interest and penalties	12.4		13.3
Reduction in income tax expense	$ 0.9	$ 0.9
Swiss Subsidiary [Member]
Additional Income Taxes (Textual) [Abstract]
General period of statute of limitations in Switzerland	5 years
Extended period of statute of limitations in Switzerland	15 years