Treasury Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended	51 Months Ended
	Nov. 30, 2014	Sep. 30, 2010	Nov. 30, 2014
Disclosure Text Block Supplement [Abstract]
Stock Repurchase Program, Authorized Amount		$ 200.0	$ 44.0	[1]
Treasury Stock, Value, Acquired, Cost Method	0
Treasury Stock, Shares, Acquired		5,199,699
Treasury Stock Acquired, Average Cost Per Share		$ 30.00
Treasury Stock, Value, Acquired, Par Value Method		$ 156.0	$ 34.1

[1] Represents the remainder of a $200.0 authorization after giving effect to the purchase of 5,199,699 shares at $30.00 per share pursuant to a large share repurchase in the form of a modified Dutch auction tender offer that was completed by the Company on November 3, 2010 for a total cost of $156.0 , excluding related fees and expenses.