Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007	Jun. 08, 2010
Income Taxes (Textual) [Abstract]
Effective tax rate	24.70%	26.40%	23.50%	26.00%
Unrecognized tax benefit	$ 37.0		$ 37.0
Proposed deduction disallowance by tax authorities					130	130	130
Notice of Assessment of corporate excise tax including penalties and interest								$ 103.5