Common Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended			6 Months Ended	12 Months Ended
	Oct. 24, 2012	Nov. 02, 2011	Oct. 29, 2010	Dec. 31, 2012	Jun. 30, 2012
Common Stock
Approved stock repurchase program, authorized amount	$ 100	$ 100	$ 40
Remaining capacity under the stock repurchase program	41.8			87.7
Repurchase of common stock (in shares)				1,480,505	2,496,595
Repurchase of common stock, amount				$ 36.9	$ 46.1