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Debt Senior Secured Second Lien Notes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on early debt extinguishment | $ 29.5 |  | $ (8.3) | $ (59.5) | $ 29.5 | $ (29.5) | $ (67.8) | $ (1.6)
Interest Expense |  | $ 126.2 |  |  | 150.4 | 298.6 | $ 465.4 | $ 426.6
10.00% Senior Secured Second Lien Notes Due 2022 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount of senior notes | $ 1,000.0 |  |  |  | $ 1,000.0 | $ 1,000.0 |  |
Stated interest rate - percentage | 10.00% |  |  |  | 10.00% | 10.00% |  |
Interest Expense |  |  |  |  |  | $ 50.0 |  |
7.375% Senior Notes due November 2016 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate - percentage | 7.375% |  |  |  | 7.375% | 7.375% |  |
Debt Instrument, Repurchased Face Amount | $ 650.0 |  |  |  | $ 650.0 | $ 650.0 |  |
Debt Instrument, Repurchase Amount | 566.9 |  |  |  | 566.9 | 566.9 |  |
Debt Instrument Redemption 2016 Notes | $ 83.1 |  |  |  | $ 83.1 | 83.1 |  |
Loss on early debt extinguishment |  |  |  |  |  | (67.8) |  |
Tender Offer Premiums Paid on 2016 Senior Notes Repurchase |  |  |  |  |  | 66.4 |  |
Write-off of debt issuance costs |  |  |  |  |  | $ 1.4 |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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