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Long-Term and Other Debt - Notes (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 17, 2017 | Nov. 21, 2014 | Jun. 04, 2014 | Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 14, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repurchase of notes |  |  |  |  | $ 1,693,400,000 | $ 39,900,000 | $ 0 |
Gain on early extinguishment of debt |  |  |  |  | $ (38,100,000) | $ 25,200,000 | $ 0 |
Senior Subordinated Notes, maturing 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt repurchased and cancelled |  |  |  | $ 9,400,000 |  |  |  |
Repurchase of notes |  |  |  | 5,700,000 |  |  |  |
Gain on early extinguishment of debt |  |  |  | 25,200,000 |  |  |  |
Write-off of unamortized debt costs |  |  |  | 800,000 |  |  |  |
Senior Subordinated Notes, maturing 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt repurchased and cancelled |  |  |  | 56,500,000 |  |  |  |
Repurchase of notes |  |  |  | $ 34,200,000 |  |  |  |
Senior Notes | Senior Unsecured Notes, maturing 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt amount |  | $ 2,200,000,000.0 |  |  |  |  |  |
Redemption price percentage |  | 100.00% |  |  |  |  |  |
Senior Notes | Senior Secured Notes, maturing 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt amount |  | $ 950,000,000.0 |  |  |  |  |  | $ 1,150,000,000.00
Senior Notes | Senior Secured Notes, maturing 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt amount | $ 350,000,000.0 |  |  |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |  |  |  |
Senior Subordinated Notes | Senior Subordinated Notes, maturing 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt amount |  |  | $ 350,000,000.0 |  |  |  |  |
Debt instrument price percentage of principal amount |  |  | 99.321% |  |  |  |  |

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