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Equities schedule of stock (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Aug. 31, 2015
USD ($)
$ / shares
shares
Class of Stock [Line Items]  
Preferred Stock, Liquidation Preference Per Share | $ / shares $ 25.00
Class B, Series 4 Preferred Stock [Member]  
Class of Stock [Line Items]  
Preferred Stock, Redemption Amount $ 517.5
Proceeds from issuance of preferred stock, net of issuance costs $ 501.0
Preferred Stock, Shares Outstanding | shares 20,700,000
Preferred Stock, Dividend Rate, Percentage 7.50%
Class B, Series 3 Preferred Stock [Member]  
Class of Stock [Line Items]  
Preferred Stock, Redemption Amount $ 492.5
Proceeds from issuance of preferred stock, net of issuance costs $ 476.7
Preferred Stock, Shares Outstanding | shares 19,700,000
Preferred Stock, Dividend Rate, Percentage 6.75%
Class B, Series 2 Preferred Stock [Member]  
Class of Stock [Line Items]  
Preferred Stock, Redemption Amount $ 420.0
Proceeds from issuance of preferred stock, net of issuance costs $ 406.2
Preferred Stock, Shares Outstanding | shares 16,800,000
Preferred Stock, Dividend Rate, Percentage 7.10%
Class B, Series 1 Preferred Stock [Member]  
Class of Stock [Line Items]  
Preferred Stock, Redemption Amount $ 451.8
Proceeds from issuance of preferred stock, net of issuance costs $ 472.8
Preferred Stock, Shares Outstanding | shares 18,071,363
Preferred Stock, Dividend Rate, Percentage 7.875%
8% Preferred Stock [Member]  
Class of Stock [Line Items]  
Preferred Stock, Redemption Amount $ 306.8
Proceeds from issuance of preferred stock, net of issuance costs $ 311.2
Preferred Stock, Shares Outstanding | shares 12,272,003
Preferred Stock, Dividend Rate, Percentage 8.00%
London Interbank Offered Rate (LIBOR) [Member] | Class B, Series 3 Preferred Stock [Member]  
Class of Stock [Line Items]  
Preferred Stock, Basis Spread on Dividends, Percent 4.155%
London Interbank Offered Rate (LIBOR) [Member] | Class B, Series 2 Preferred Stock [Member]  
Class of Stock [Line Items]  
Preferred Stock, Basis Spread on Dividends, Percent 4.298%
Maximum | Class B, Series 3 Preferred Stock [Member]  
Class of Stock [Line Items]  
Preferred Stock, Basis Spread on Dividends, Percent 8.00%
Maximum | Class B, Series 2 Preferred Stock [Member]  
Class of Stock [Line Items]  
Preferred Stock, Basis Spread on Dividends, Percent 8.00%