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Debt Schedule of Extinguishment of Debt - Open Market Repurchases (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Extinguishment of Debt [Line Items] |  |  |
Total Consideration |  | $ 664.5 |
8.50% Senior notes due 2019 |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt instrument interest rate stated percentage | 8.50% |  | 8.50%
6.875% Senior notes due 2020 |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt instrument interest rate stated percentage | 6.875% |  | 6.875%
4.70% Senior notes due 2021 |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt instrument interest rate stated percentage | 4.70% |  | 4.70%
Senior Notes | Senior Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Aggregate Principal Amount Repurchased | $ 194.1 | 649.5 |
Total Consideration | 204.5 |  |
Senior Notes | 8.50% Senior notes due 2019 | Senior Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Aggregate Principal Amount Repurchased | 54.6 | 145.8 |
Total Consideration | 60.1 |  |
Senior Notes | 6.875% Senior notes due 2020 | Senior Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Aggregate Principal Amount Repurchased | 100.1 | 129.8 |
Total Consideration | 105.1 |  |
Senior Notes | 4.70% Senior notes due 2021 | Senior Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Aggregate Principal Amount Repurchased | 39.4 | $ 373.9 |
Total Consideration | $ 39.3 |  |

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