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Debt Debt Schedule (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | May 18, 2016 | Apr. 18, 2016 | Apr. 15, 2016 | Apr. 13, 2016 | Mar. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net | $ 89.0 |  |  |  | $ 89.0 | $ 89.0 |  |  |  |  |  |  |
Loss on early debt extinguishment | (29.5) |  | $ 8.3 | $ 59.5 | (29.5) | 29.5 | $ 67.8 | $ 1.6 |  |  |  |  |
Capital lease obligations | 19.7 |  |  |  | 19.7 | 19.7 | 30.3 |  |  |  |  |  |
Other long-term debt | 0.4 |  |  |  | 0.4 | 0.4 | 0.7 |  |  |  |  |  |
Liabilities Subject to Compromise | 8,440.2 |  |  |  | 8,440.2 | 8,440.2 | 0.0 |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Current | 20.2 |  |  |  | 20.2 | 20.2 | 5,874.9 |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations | 0.0 |  |  |  | 0.0 | 0.0 | 366.3 |  |  |  |  |  |
Contractual interest expense |  |  |  |  |  | 564.9 |  |  |  |  |  |  |
Interest Expense, Stayed Amount |  |  |  |  |  | 266.3 |  |  |  |  |  |  |
DIP Facility - Bonding Accommodation Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 200.0 | $ 200.0 |
DIP Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Letters of Credit, Maximum |  |  |  |  |  |  |  |  |  |  |  | 50.0 |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | 1,558.1 |  |  |  | 1,558.1 | 1,558.1 | 0.0 |  |  |  |  |  | $ 947.0
Exit facility, maximum borrowing capacity | 1,650.0 |  |  |  | 1,650.0 | 1,650.0 |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount | $ 611.0 |  |  |  | $ 611.0 | $ 611.0 |  |  |  |  |  | 675.0 |
Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate - percentage | 4.50% |  |  |  | 4.50% | 4.50% |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity | $ 950.0 |  |  |  | $ 950.0 | $ 950.0 |  |  |  |  |  |  |
2013 Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Outstanding Principal | 1,170.0 |  |  |  | 1,170.0 | 1,170.0 |  |  |  |  |  |  |
Long-term Debt | 1,154.5 |  |  |  | 1,154.5 | 1,154.5 | 1,156.3 |  |  |  |  |  |
Exit facility, maximum borrowing capacity | $ 1,200.0 |  |  |  | $ 1,200.0 | $ 1,200.0 |  |  |  |  |  |  |
7.375% Senior Notes due November 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate - percentage | 7.375% |  |  |  | 7.375% | 7.375% |  |  |  |  |  |  |
Loss on early debt extinguishment |  |  |  |  |  | $ 67.8 |  |  |  |  |  |  |
Write-off of debt issuance costs |  |  |  |  |  | $ 1.4 |  |  |  |  |  |  |
6.00% Senior Notes due November 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate - percentage | 6.00% |  |  |  | 6.00% | 6.00% |  |  |  |  |  |  |
Debt Instrument, Outstanding Principal | $ 1,518.8 |  |  |  | $ 1,518.8 | $ 1,518.8 |  |  |  |  |  |  |
Long-term Debt | $ 1,509.9 |  |  |  | $ 1,509.9 | $ 1,509.9 | 1,508.9 |  |  |  |  |  |
6.50% Senior Notes due September 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate - percentage | 6.50% | 6.50% |  |  | 6.50% | 6.50% |  |  |  |  |  |  |
Debt Instrument, Outstanding Principal | $ 650.0 |  |  |  | $ 650.0 | $ 650.0 |  |  |  |  |  |  |
Long-term Debt | $ 645.8 |  |  |  | $ 645.8 | $ 645.8 | 645.5 |  |  |  |  |  |
6.25% Senior Notes due November 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate - percentage | 6.25% | 6.25% |  |  | 6.25% | 6.25% |  |  |  |  |  |  |
Debt Instrument, Outstanding Principal | $ 1,339.6 |  |  |  | $ 1,339.6 | $ 1,339.6 |  |  |  |  |  |  |
Long-term Debt | $ 1,327.7 |  |  |  | $ 1,327.7 | $ 1,327.7 | 1,327.0 |  |  |  |  |  |
10.00% Senior Secured Second Lien Notes Due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate - percentage | 10.00% |  |  |  | 10.00% | 10.00% |  |  |  |  |  |  |
Debt Instrument, Outstanding Principal | $ 1,000.0 |  |  |  | $ 1,000.0 | $ 1,000.0 |  |  |  |  |  |  |
Long-term Debt | 962.3 |  |  |  | 962.3 | 962.3 | 960.4 |  |  |  |  |  |
Face amount of senior notes | $ 1,000.0 |  |  |  | $ 1,000.0 | $ 1,000.0 |  |  |  |  |  |  |
7.875% Senior Notes due November 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate - percentage | 7.875% | 7.875% |  |  | 7.875% | 7.875% |  |  |  |  |  |  |
Debt Instrument, Outstanding Principal | $ 250.0 |  |  |  | $ 250.0 | $ 250.0 |  |  |  |  |  |  |
Long-term Debt | 245.9 |  |  |  | 245.9 | 245.9 | 245.8 |  |  |  |  |  |
Convertible Junior Subordinated Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Outstanding Principal | 732.5 |  |  |  | 732.5 | 732.5 |  |  |  |  |  |  |
Long-term Debt | 367.1 |  |  |  | 367.1 | 367.1 | 366.3 |  |  |  |  |  |
Long-term Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities Subject to Compromise | $ 7,771.2 |  |  |  | $ 7,771.2 | 7,771.2 | 0.0 |  |  |  |  |  |
DIP Facility - Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  | 500.0 |
DIP Facility - Initially Available [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  | $ 200.0 | 200.0 | 200.0 |
DIP Facility - Remaining Availability [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  | $ 300.0 |  |  | 300.0 |
DIP Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Cost |  | $ 26.8 |  |  |  |  |  |  |  |  |  |  |
Loss on early debt extinguishment |  |  |  |  |  | $ (29.5) |  |  |  |  |  |  |
Early Repayment of DIP Financing |  |  |  |  |  | 10 |  |  |  |  |  |  |
Write-off of debt issuance costs |  |  |  |  |  | $ 19.5 |  |  |  |  |  |  |
DIP Facility - Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  |  |  |  | $ 100.0 | $ 100.0 |
6.000% Senior Secured Notes Due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate - percentage | 6.00% |  |  |  | 6.00% | 6.00% |  |  |  |  |  |  |
Face amount of senior notes | $ 500.0 |  |  |  | $ 500.0 | $ 500.0 |  |  |  |  |  |  |
6.375% Senior Secured Notes Due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate - percentage | 6.375% |  |  |  | 6.375% | 6.375% |  |  |  |  |  |  |
Face amount of senior notes | $ 500.0 |  |  |  | $ 500.0 | $ 500.0 |  |  |  |  |  |  |
Reported Value Measurement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and capital lease obligations | $ 7,791.4 |  |  |  | $ 7,791.4 | $ 7,791.4 | $ 6,241.2 |  |  |  |  |  |
Eurocurrency Rate [Member] | Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  |  |  |  |  | 1.00% |  |  |  |  |  |  |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 + Details
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