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Debt - Senior Unsecured Notes (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, gross | $ 5,513,437,000 |  |  |  |  |  |  | $ 5,513,437,000 |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  | 44,162,000 | $ 54,227,000 | $ 46,020,000
Senior unsecured notes | 5,258,550,000 |  |  |  |  |  |  | $ 5,258,550,000 | 6,396,451,000 |
Senior Unsecured Debt 5.375% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes |  | $ 700,000,000 | $ 500,000,000 |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.375% | 5.375% |  |  |  |  |  |  |
Loss on extinguishment of debt |  | $ 44,000,000 |  |  |  |  |  |  |  |
Senior Unsecured Debt 3.75 % |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes | $ 450,000,000 |  |  |  |  |  | $ 500,000,000 |  |  |
Interest rate (as a percent) | 3.75% |  |  |  |  |  | 3.75% | 3.75% |  |
Senior Unsecured Debt 5.625% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes |  |  |  | $ 250,000,000 |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.625% |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 54,000,000 |  |  |  |  |  |  |
Senior Unsecured Debt 6.300% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes |  |  |  |  |  | $ 400,000,000 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 6.30% |  |  |  |
Senior Unsecured Debt 6.000% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes |  |  |  |  | $ 500,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 6.00% |  |  |  |  | 6.00%
Loss on extinguishment of debt |  |  |  |  | $ 46,000,000 |  |  |  |  |
Senior Unsecured Debt 6.700% |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes |  |  |  |  | $ 600,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 6.70% |  |  |  |  | 6.70%
Unsecured Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, gross | $ 5,300,000,000 |  |  |  |  |  |  | $ 5,300,000,000 |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |
Senior unsecured notes | $ 0 |  |  |  | $ 0 |  |  | $ 0 | $ 0 | $ 0

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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