Equity and Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Feb. 10, 2016	Sep. 30, 2016	Sep. 30, 2015	Feb. 29, 2016	Jun. 30, 2016	Sep. 15, 2015	Sep. 14, 2015
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		53,300,000			52,900,000
Disclosure of Repurchase Agreements [Abstract]
PercentOfSharesReceivedUnderASR		80.00%
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Net income attributable to common stock		$ 37.8	$ 24.9
Weighted average number of shares outstanding, used in computing basic earnings per share		52,900,000	55,000,000
Dilutive common stock equivalents		800,000	900,000
Weighted average number of shares outstanding used in computing diluted earnings per share		53,700,000	55,900,000
Basic earnings per share		$ 0.71	$ 0.45
Diluted earnings per share		$ 0.70	$ 0.45
Anti-dilutive options (excluded from the calculation of diluted earnings per share)		800,000	900,000
FY2017StockRepurchasePlan [Member] [Domain] [Domain]
Disclosure of Repurchase Agreements [Abstract]
Stock Repurchase Program Authorized Amount							$ 200.0
FY2016StockRepurchasePlan [Member] [Member] [Domain]
Disclosure of Repurchase Agreements [Abstract]
Accelerated Share Repurchases, Final Price Paid Per Share		$ 62.92
Accelerated Share Repurchases, Initial Price Paid Per Share		$ 70.35
Stock Repurchase Program Authorized Amount						$ 200.0
Treasury Stock, Shares, Acquired	900,000	2,274,343		0
Treasury Stock, Value, Acquired, Cost Method		$ 0.0