Basis of Presentation (Details) (USD $) In Millions, except Per Share data, 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, 2012
Basis of Presentation [Abstract]
Reversal of income tax valuation allowance related to foreign country	$ 15.1
Impact of reversal of valuation allowance (in dollars per share)	$ 0.41
Number of weeks in fiscal period, minimum (in weeks)					52
Number of weeks in fiscal period, maximum (in weeks)					53
Number of weeks in second quarter (in weeks)	13	13
Number of weeks year to date (in weeks)			39	39