Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 15, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007	Jun. 08, 2010
Income Taxes (Textual) [Abstract]
Effective tax rate		27.40%	24.70%	22.50%	23.50%
Deferred tax liability recognized				$ 203.7
Net benefit for a previously unrecognized position		33.0		33.0
Expense for non-income based state taxes		10.0		10.0
Net benefit from remeasurement of uncertain tax position		7.0		7.0
Proposed deduction disallowance by tax authorities						130.0	130.0	130.0
Notice of Assessment of corporate excise tax including penalties and interest									103.5
Settlement with the Massachusetts DOR	$ 5.0