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Shareholders' Equity / Partners' Capital - Perpetual Preferred Shares (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Sep. 30, 2017 | Jun. 30, 2017
Series F Perpetual Preferred Shares |  |
Class of Stock [Line Items] |  |
Shares issued during period (in shares) |  | 6,200,000
Preferred stock, dividend rate, percentage |  | 5.875%
Proceeds from issuance of preferred stock |  | $ 155.0
Stock issuance costs |  | $ 5.3
Liquidation preference per share (in dollars per share) |  | $ 25.00
Series G, Preferred Perpetual Shares |  |
Class of Stock [Line Items] |  |
Shares issued during period (in shares) | 4,600,000 |
Preferred stock, dividend rate, percentage | 5.875% |
Proceeds from issuance of preferred stock | $ 115.0 |
Stock issuance costs | $ 4.1 |
Liquidation preference per share (in dollars per share) | $ 25.00 |

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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=6928386&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=6928386&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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