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Treasury Stock (Details) - Schedule of repurchase of common stock (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended 51 Months Ended
Nov. 30, 2014
Sep. 30, 2010
Nov. 30, 2014
Schedule of repurchase of common stock [Abstract]      
September 2010   $ 200.0us-gaap_StockRepurchaseProgramAuthorizedAmount $ 44.0us-gaap_StockRepurchaseProgramAuthorizedAmount [1]
Less repurchases made under this authorization   (156.0)us-gaap_TreasuryStockValueAcquiredParValueMethod (34.1)us-gaap_TreasuryStockValueAcquiredParValueMethod
Remaining Board authorization at Febuary 28, 2014 $ 9.9us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount   $ 9.9us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
[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.