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Debt Schedule of Extinguishment of Debt - Exchange Offers (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Extinguishment of Debt [Line Items] |  |  |
Debt Instrument, Repurchased Amount Paid in Cash |  | $ 332.5 |
Debt Instrument, Repurchase Amount |  | 664.5 |
8.50% senior notes due 2019 exchanged for 8.00% senior notes due 2024 [Member] |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt Instrument, Repurchased Amount Paid in Cash |  | 81.7 |
Debt Instrument, Repurchase Amount |  | 163.3 |
6.875% senior notes due 2024 exchanged for 8.00% senior notes due 2024 [Member] |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt Instrument, Repurchased Amount Paid in Cash |  | 69.4 |
Debt Instrument, Repurchase Amount |  | 138.7 |
4.70% senior notes due 2021 exchanged for 8.00% senior notes due 2024 [Member] |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt Instrument, Repurchased Amount Paid in Cash |  | 181.4 |
Debt Instrument, Repurchase Amount |  | 362.5 |
Senior Notes [Member] | Senior Notes [Member] |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt Instrument, Repurchased Face Amount | $ 194.1 | 649.5 |
Debt Instrument, Repurchase Amount | 204.5 |  |
Senior Notes [Member] | 8.50% Senior notes due 2019 | Senior Notes [Member] |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt Instrument, Repurchased Face Amount | 54.6 | 145.8 |
Debt Instrument, Repurchase Amount | 60.1 |  |
Senior Notes [Member] | 8.50% senior notes due 2019 exchanged for 8.00% senior notes due 2024 [Member] |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt Instrument, Face Amount |  | 81.6 |
Senior Notes [Member] | 6.875% Senior notes due 2020 | Senior Notes [Member] |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt Instrument, Repurchased Face Amount | 100.1 | 129.8 |
Debt Instrument, Repurchase Amount | 105.1 |  |
Senior Notes [Member] | 6.875% senior notes due 2024 exchanged for 8.00% senior notes due 2024 [Member] |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt Instrument, Face Amount |  | 69.3 |
Senior Notes [Member] | 4.70% Senior notes due 2021 | Senior Notes [Member] |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt Instrument, Repurchased Face Amount | 39.4 | 373.9 |
Debt Instrument, Repurchase Amount | $ 39.3 |  |
Senior Notes [Member] | 4.70% senior notes due 2021 exchanged for 8.00% senior notes due 2024 [Member] |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt Instrument, Face Amount |  | 181.1 |
Senior Notes [Member] | 8.00% Senior notes due 2024 |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt Instrument, Face Amount |  | $ 332.0 |
Senior Notes [Member] |  |  |
Extinguishment of Debt [Line Items] |  |  |
Debt Instrument, Repurchased Amount Paid in Cash |  |  | $ 332.5

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