Equity and Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		5 Months Ended	7 Months Ended	12 Months Ended		13 Months Ended	15 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013	Mar. 31, 2013	Jul. 31, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Jul. 31, 2013	Sep. 30, 2013	Aug. 14, 2015	Jun. 30, 2015	Aug. 01, 2013
Class of Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method								$ 197.6
Entity Common Stock, Shares Outstanding											55,338,272
Preferred Stock, Shares Authorized							5,000,000					5,000,000
Preferred Stock, Par or Stated Value Per Share							$ 0.01					$ 0.01
Preferred Stock, Shares Outstanding							0					0
Common Stock, Shares Authorized							150,000,000					150,000,000
Common Stock, Par or Stated Value Per Share							$ 0.01					$ 0.01
Common Stock, Shares, Outstanding							54,661,877					55,237,068
Percent of advance payment under accelerated share repurchase agreement							80.00%
2012 Stock Repurchase Plan [Member]
Class of Stock [Line Items]
Stock Repurchase Program Authorized Amount													$ 200.0
Treasury Stock, Value, Acquired, Cost Method										$ 200.0
Treasury Stock, Shares, Acquired										5,458,285
Treasury Stock, Value, Acquired, Average Cost Per Share										$ 36.64
Stock Repurchase Program, Remaining Authorized Repurchase Amount								2.4
March 2013 Accelerated Share Repurchase [Member]
Class of Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method					$ 50.0			$ 50.0
Treasury Stock, Shares, Acquired	1,044,932		101,247		1,146,179
Percent of advance payment under accelerated share repurchase agreement								80.00%
Treasury Stock, Value, Acquired, Average Cost Per Share					$ 43.62			$ 38.28
September 2012 Accelerated Share Repurchase [Member]
Class of Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method						$ 50.0		$ 50.0
Treasury Stock, Shares, Acquired		1,328,462		234,898		1,563,360
Treasury Stock, Value, Acquired, Average Cost Per Share						$ 31.98
Open Market Repurchases [Member]
Class of Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method								$ 97.6	$ 100.0
Treasury Stock, Shares, Acquired			51,071					2,697,675	2,748,746
Treasury Stock, Value, Acquired, Average Cost Per Share								$ 36.17	$ 36.38
March Open Market Repurchases [Member]
Class of Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method								$ 50.0