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Debt Schedule of Extinguishment of Debt - Tender Offers and Repurchases (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Feb. 28, 2018 | Feb. 09, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | $ 721.8 |  |  |  |
Debt Instrument, Repurchased Amount Paid in Cash | 771.0 |  |  |  |
Gain (Loss) on Extinguishment of Debt | 18.8 | $ 3.4 |  |  |
8.50% senior notes due 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 237.6 |  |  |  |
Debt Instrument, Repurchased Amount Paid in Cash | $ 256.8 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.50% |  |  |  | 8.50%
6.875% senior notes due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | $ 328.0 |  |  |  |
Debt Instrument, Repurchased Amount Paid in Cash | $ 354.5 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.875% |  |  |  | 6.875%
4.70% senior notes due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | $ 156.2 |  |  |  |
Debt Instrument, Repurchased Amount Paid in Cash | $ 159.7 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.70% |  |  |  |
8.00% senior notes due 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% |  |  |  | 8.00%
Senior Notes [Member] | 8.50% senior notes due 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | $ 55.0 | $ 182.6 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 8.50%
Senior Notes [Member] | 6.875% senior notes due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | $ 71.4 | $ 256.6 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.875%
Senior Notes [Member] | 4.70% senior notes due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Repurchased Face Amount | $ 156.2 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 4.70%

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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 Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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