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Commitments and Contingencies Contingencies (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 15 Months Ended
May 31, 2014
May 31, 2014
Loss Contingencies [Line Items]    
Loss Contingency, Range of Possible Loss, Minimum $ 13.4 $ 13.4
Loss Contingency, Range of Possible Loss, Maximum 21.1 21.1
Loss Contingency, Loss in Period   18.0
Loss Contingency Accrual, Payments 9.6  
Insurance Recoveries   $ 0