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Debt Credit Agreement (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Apr. 13, 2016
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest Expense, Adequate Protection Payments |  |  |  | $ 121.4 |  |  |  |
Proceeds from long-term debt |  |  | $ 511.4 | 1,458.4 | $ 975.7 | $ 1.1 |  |
Payments of Debt Restructuring Costs | $ 10.3 | $ 26.4 |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity |  |  | 1,650.0 | 1,650.0 |  |  |  |
Long-term Debt |  | $ 947.0 | 1,558.1 | 1,558.1 | 0.0 |  |  |
Letters of credit outstanding |  |  | 611.0 | 611.0 |  |  |  | $ 675.0
Investments and Other Noncurrent Assets |  |  | 479.3 | 479.3 |  |  |  |
Term Loan Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity |  |  | $ 950.0 | $ 950.0 |  |  |  |
Stated interest rate - percentage |  |  | 4.50% | 4.50% |  |  |  |
2013 Term Loan Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Exit facility, maximum borrowing capacity |  |  | $ 1,200.0 | $ 1,200.0 |  |  |  |
Long-term Debt |  |  | 1,154.5 | 1,154.5 | 1,156.3 |  |  |
6.00% Senior Notes due November 2018 [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 1,509.9 | $ 1,509.9 | 1,508.9 |  |  |
Stated interest rate - percentage |  |  | 6.00% | 6.00% |  |  |  |
6.25% Senior Notes due November 2021 [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 1,327.7 | $ 1,327.7 | 1,327.0 |  |  |
Stated interest rate - percentage |  |  | 6.25% | 6.25% |  |  | 6.25% |
6.50% Senior Notes due September 2020 [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 645.8 | $ 645.8 | 645.5 |  |  |
Stated interest rate - percentage |  |  | 6.50% | 6.50% |  |  | 6.50% |
7.875% Senior Notes due November 2026 [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 245.9 | $ 245.9 | $ 245.8 |  |  |
Stated interest rate - percentage |  |  | 7.875% | 7.875% |  |  | 7.875% |
Eurocurrency Rate [Member] | Term Loan Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  |  |  | 1.00% |  |  |  |

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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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