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Shareholders' Equity / Partners' Capital - Perpetual Preferred Shares (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |
Liquidation preference per share (in dollars per share) |  |  |  | $ 25 |
Preferred stock, change in control redemption period |  |  |  | 120 days |
Preferred shares, shares issued (in shares) |  |  |  | 38,350,000 | 37,010,000
Series D Perpetual Preferred Shares/Units |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Shares dividend rate |  |  | 6.50% | 6.50% |
Preferred shares, shares issued (in shares) |  |  | 10,750,000 |  |
Gross proceeds from issuance of Preferred shares before offering costs |  |  | $ 268.8 |  |
Adjustments to additional paid in capital, stock issued, issuance costs |  |  | $ 8.5 |  |
Series E Perpetual Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Shares dividend rate |  |  |  | 6.35% |
Preferred shares, shares issued (in shares) |  |  | 9,200,000 |  |
Gross proceeds from issuance of Preferred shares before offering costs |  |  | $ 230.0 |  |
Adjustments to additional paid in capital, stock issued, issuance costs |  |  | $ 7.5 |  |
Series F Perpetual Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Shares dividend rate |  |  |  | 5.875% |
Liquidation preference per share (in dollars per share) |  | $ 25.00 |  |  |
Issuance of perpetual preferred shares, net of offering costs (in shares) |  | 6,200,000 |  |  |
Proceeds from issuance of redeemable preferred stock |  | $ 155.0 |  |  |
Offering costs |  | $ 5.3 |  |  |
Series G Perpetual Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Shares dividend rate |  |  |  | 5.875% |
Liquidation preference per share (in dollars per share) | $ 25.00 |  |  |  |
Issuance of perpetual preferred shares, net of offering costs (in shares) | 4,600,000 |  |  |  |
Proceeds from issuance of redeemable preferred stock | $ 115.0 |  |  |  |
Offering costs | $ 4.1 |  |  |  |

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- Definition Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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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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