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Equities schedule of stock (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2017 | Mar. 30, 2017 | Mar. 31, 2016
Class of Stock [Line Items] |  |  |
Preferred Stock, Liquidation Preference Per Share | $ 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 | 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 | 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 | 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 | $ 536.5 |  |
Proceeds from issuance of preferred stock, net of issuance costs | $ 569.3 |  |
Preferred Stock, Shares Outstanding | 21,459,066 |  |
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 | 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% |  |
Capital Equity Certificates |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock, Redemption Amount |  | $ 17.4 | $ 67.3

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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