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Debt - Senior Secured Second Priority Notes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 09, 2019 | Dec. 31, 2018 | Jun. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt | $ 51.0 | $ 53.6 | $ 5.4 |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost | 41.5 | $ 41.5 | $ 3.7 |  |  |
Write off of Deferred Debt Issuance Cost | $ 9.5 |  |  |  |  |
2027 Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |  |  |
2027 Notes [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 105.50% |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 40.00% |  |  |  |
2027 Notes [Member] | Debt Instrument, Redemption, Period Two [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 102.75% |  |  |  |
2027 Notes [Member] | Debt Instrument, Redemption, Period Three [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 101.833% |  |  |  |
2027 Notes [Member] | Debt Instrument, Redemption, Period Four [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.917% |  |  |  |
2027 Notes [Member] | Debt Instrument, Redemption, Period Five [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |  |  |
2027 Notes [Member] | Debt Instrument, Redemption, Period Six [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 101.00% |  |  |  |
2027 Notes [Member] | Debt Instrument, Redemption, Period Seven [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |  |  |
Senior Notes [Member] | 2022 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 610.0
Debt Instrument, Interest Rate, Stated Percentage | 7.50% | 7.50% |  |  |  |
Aggregate principal amount redeemed | $ 183.0 | $ 183.0 |  | $ 427.0 |  |
Debt, gross | $ 0.0 | $ 0.0 |  |  | $ 427.0 |
Senior Notes [Member] | 2027 Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.50% | 5.50% |  |  |  |
Debt, gross | $ 1,200.0 | $ 1,200.0 |  |  | 0.0 |
Senior Notes [Member] | 2024 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 625.0
Debt Instrument, Interest Rate, Stated Percentage | 7.75% | 7.75% |  |  |  |
Aggregate principal amount redeemed | $ 187.5 | $ 187.5 |  | $ 437.5 |  |
Debt, gross | $ 0.0 | $ 0.0 |  |  | $ 437.5 |

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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=119400593&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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