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Debt Schedule of Extinguishment of Debt - Tender Offers and Repurchases (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Feb. 28, 2018 | Feb. 09, 2018 | Dec. 31, 2017
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Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount Repurchased | $ 721.8 |  |  |
Aggregate Repurchase Price | $ 771.2 |  |  |
8.50% senior notes due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage | 8.50% |  |  |
Aggregate Principal Amount Repurchased | $ 237.6 |  |  |
Aggregate Repurchase Price | $ 256.8 |  |  |
6.875% Senior notes due 2020(2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage | 6.875% |  |  | 6.875%
Aggregate Principal Amount Repurchased | $ 328.0 |  |  |
Aggregate Repurchase Price | $ 354.7 |  |  |
4.70% Senior notes due 2021(2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage | 4.70% |  |  | 4.70%
Aggregate Principal Amount Repurchased | $ 156.2 |  |  |
Aggregate Repurchase Price | $ 159.7 |  |  |
Senior Notes | 8.50% senior notes due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage | 8.50% |  |  |
Aggregate Principal Amount Repurchased |  | $ 55.0 | $ 182.6 |
Senior Notes | 6.875% Senior notes due 2020(2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage | 6.875% |  |  |
Aggregate Principal Amount Repurchased |  | $ 71.4 | $ 256.6 |
Senior Notes | 4.70% Senior notes due 2021(2) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate stated percentage | 4.70% |  |  |

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- Definition Debt Instrument, Repurchased Amount Paid in Cash + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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