Share Repurchase Program (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended		1 Months Ended		3 Months Ended	35 Months Ended
	Jul. 31, 2014	Dec. 11, 2013	Jul. 31, 2012	Aug. 31, 2011	Jun. 30, 2014	Jun. 30, 2014
Stock Repurchase Program, Authorized Amount	$ 100	$ 100	$ 100	$ 100
Treasury Stock, Shares, Acquired					1,712,046	6,351,870
Treasury Stock Acquired, Average Cost Per Share					$ 51.56	$ 36.26
Treasury Stock [Member]
Treasury Stock, Value, Acquired, Cost Method					$ 88.3	$ 230.3