Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Income Taxes (Textual) [Abstract]
Tax benefit primarily related to favorable claims filed			$ 3.5
Additions for tax positions related to the current year			2.0	1.8
Additions for tax positions of prior years				14.5
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	20.2	17.5	20.2
Amounts subject to a lapse in statute			2.5
Total accrued interest and penalties	12.5		12.5		13.3
Increase in tax expenses due to uncertain tax position	$ 0.1	$ 0.9	$ 0.8	$ 1.8
Opening period of statue of limitations of audit cycle			Jun. 30, 2013
Swiss Subsidiary [Member]
Additional Income Taxes (Textual) [Abstract]
Number of Subsidiaries			2
General period of statute of limitations in Switzerland			5 years
Extended period of statute of limitations in Switzerland			15 years