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	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2015	Sep. 30, 2014	Oct. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 15, 2015	Sep. 14, 2015	Jun. 02, 2014
Class of Stock [Line Items]
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		53,200,000			55,200,000
Disclosure of Repurchase Agreements [Abstract]
PercentOfSharesReceivedUnderASR		80.00%
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Net income attributable to common stock		$ 24.9	$ 37.1
Weighted average number of shares outstanding, used in computing basic earnings per share		55,000,000	54,700,000
Dilutive common stock equivalents		900,000	1,100,000
Weighted average number of shares outstanding used in computing diluted earnings per share		55,900,000	55,800,000
Basic earnings per share		$ 0.45	$ 0.68
Diluted earnings per share		$ 0.45	$ 0.67
Anti-dilutive options (excluded from the calculation of diluted earnings per share)		900,000	400,000
FY2016StockRepurchasePlan [Member] [Member] [Domain]
Disclosure of Repurchase Agreements [Abstract]
Stock Repurchase Program Authorized Amount							$ 200.0	$ 200.0
Treasury Stock, Shares, Acquired		2,274,343
Treasury Stock, Value, Acquired, Cost Method		$ 0.0
Accelerated Share Repurchases, Initial Price Paid Per Share		$ 70.35
FiscalYear2014StockRepurchasePlan [Member] [Member]
Disclosure of Repurchase Agreements [Abstract]
Stock Repurchase Program Authorized Amount									$ 150.0
Treasury Stock, Shares, Acquired		345,165		2,630,009	2,284,844
Treasury Stock, Value, Acquired, Cost Method					$ 150.0	$ 150.0
Accelerated Share Repurchases, Initial Price Paid Per Share				$ 57.03	$ 52.52
September 2012 Accelerated Share Repurchase [Member]
Disclosure of Repurchase Agreements [Abstract]
Treasury Stock, Value, Acquired, Cost Method	$ 50.0
September Open Market Repurchases [Member]
Disclosure of Repurchase Agreements [Abstract]
Treasury Stock, Value, Acquired, Cost Method	$ 50.0