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Long-term Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2017	Apr. 01, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Capital lease and other obligations	$ 79.9
Less: Liabilities subject to compromise		$ 8,077.4	$ 8,080.3
Successor
Debt Instrument [Line Items]
Capital lease and other obligations	92.4
Less: Debt issuance costs	(78.4)
Total debt	1,957.1
Less: Current portion of long-term debt	189.0
Less: Liabilities subject to compromise	0.0
Long-term debt	1,768.1
Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Long-term debt	$ 500.0
Stated interest rate	6.00%
Successor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Long-term debt	$ 500.0
Stated interest rate	6.375%
Successor | Senior Notes | 6.00% Senior Notes due November 2018
Debt Instrument [Line Items]
Long-term debt	$ 0.0
Stated interest rate	6.00%
Successor | Senior Notes | 6.50% Senior Notes due September 2020
Debt Instrument [Line Items]
Long-term debt	$ 0.0
Stated interest rate	6.50%
Successor | Senior Notes | 6.25% Senior Notes due November 2021
Debt Instrument [Line Items]
Long-term debt	$ 0.0
Stated interest rate	6.25%
Successor | Senior Notes | 10.00% Senior Secured Second Lien Notes due March 2022
Debt Instrument [Line Items]
Long-term debt	$ 0.0
Stated interest rate	10.00%
Successor | Senior Notes | 7.875% Senior Notes due November 2026
Debt Instrument [Line Items]
Long-term debt	$ 0.0
Stated interest rate	7.875%
Successor | Term Loan | Senior Secured Term Loan due 2022
Debt Instrument [Line Items]
Long-term debt	$ 943.1
Successor | Term Loan | 2013 Term Loan Facility due September 2020
Debt Instrument [Line Items]
Long-term debt	0.0
Successor | Line of Credit | Revolving Credit Facility | 2013 Revolver
Debt Instrument [Line Items]
Long-term debt	0.0
Successor | Subordinated Debt | Convertible Junior Subordinated Debentures due December 2066
Debt Instrument [Line Items]
Long-term debt	$ 0.0
Predecessor
Debt Instrument [Line Items]
Capital lease and other obligations			20.1
Less: Debt issuance costs			(70.8)
Total debt			7,791.4
Less: Current portion of long-term debt			20.2
Less: Liabilities subject to compromise			7,771.2
Long-term debt			0.0
Predecessor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Long-term debt			$ 0.0
Stated interest rate			6.00%
Predecessor | Senior Notes | 6.00% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Long-term debt			$ 0.0
Stated interest rate			6.375%
Predecessor | Senior Notes | 6.00% Senior Notes due November 2018
Debt Instrument [Line Items]
Long-term debt			$ 1,518.8
Stated interest rate			6.00%
Predecessor | Senior Notes | 6.50% Senior Notes due September 2020
Debt Instrument [Line Items]
Long-term debt			$ 650.0
Stated interest rate			6.50%
Predecessor | Senior Notes | 6.25% Senior Notes due November 2021
Debt Instrument [Line Items]
Long-term debt			$ 1,339.6
Stated interest rate			6.25%
Predecessor | Senior Notes | 10.00% Senior Secured Second Lien Notes due March 2022
Debt Instrument [Line Items]
Long-term debt			$ 979.4
Stated interest rate			10.00%
Predecessor | Senior Notes | 7.875% Senior Notes due November 2026
Debt Instrument [Line Items]
Long-term debt			$ 247.8
Stated interest rate			7.875%
Predecessor | Term Loan | Senior Secured Term Loan due 2022
Debt Instrument [Line Items]
Long-term debt			$ 0.0
Predecessor | Term Loan | 2013 Term Loan Facility due September 2020
Debt Instrument [Line Items]
Long-term debt			1,162.3
Predecessor | Line of Credit | Revolving Credit Facility | 2013 Revolver
Debt Instrument [Line Items]
Long-term debt			1,558.1
Predecessor | Subordinated Debt | Convertible Junior Subordinated Debentures due December 2066
Debt Instrument [Line Items]
Long-term debt			$ 386.1

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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.

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