Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended	13 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended	13 Months Ended	12 Months Ended
	Jun. 30, 2013	Sep. 30, 2012 September 2012 Accelerated Share Repurchase [Member]	Mar. 31, 2013 September 2012 Accelerated Share Repurchase [Member]	Jun. 30, 2013 September 2012 Accelerated Share Repurchase [Member]	Mar. 31, 2013 March 2013 Accelerated Share Repurchase [Member]	Sep. 30, 2013 March 2013 Accelerated Share Repurchase [Member]	Jun. 30, 2013 March 2013 Accelerated Share Repurchase [Member]	Jul. 31, 2013 March 2013 Accelerated Share Repurchase [Member]	Jun. 30, 2013 2012StockRepurchasePlan [Member]	Jun. 30, 2013 September Open Market Repurchases [Member]	Sep. 30, 2013 Open Market Repurchases [Member]	Jun. 30, 2013 Open Market Repurchases [Member]	Jul. 31, 2013 Open Market Repurchases [Member]	Jun. 30, 2013 March Open Market Repurchases [Member]
Class of Stock [Line Items]
Shares Paid for Tax Withholding for Share Based Compensation	251,296
Stock Repurchase Program, Remaining Authorized Repurchase Amount									$ 2.4
Stock repurchase program, authorized value									200
Treasury Stock, Value, Acquired, Cost Method	$ 197.6			$ 50.0			$ 50.0			$ 50.0		$ 97.6	$ 100.0	$ 50.0
Treasury Stock, Shares, Acquired		1,328,462	234,898	1,563,360	1,044,932	101,247		1,146,179			51,071	2,697,675	2,748,746
Percent of advance payment under accelerated share repurchase agreement							80.00%
Treasury Stock Acquired, Average Cost Per Share				$ 31.98			$ 38.28	$ 43.62				$ 36.17	$ 36.38