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Long-term Debt - Schedule of Debt (Details) - Successor - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Capital lease and other obligations	$ 51.1	$ 76.0
Less: Debt issuance costs	(71.9)	(59.4)
Total debt	1,376.2	1,460.8
Less: Current portion of long-term debt	42.0	42.1
Long-term debt	1,334.2	1,418.7
Senior Notes | 6.000% Senior Secured Notes due March 2022
Debt Instrument [Line Items]
Long-term debt	$ 500.0	$ 500.0
Stated interest rate	6.00%	6.00%
Senior Notes | 6.375% Senior Secured Notes due March 2025
Debt Instrument [Line Items]
Long-term debt	$ 500.0	$ 500.0
Stated interest rate	6.375%	6.375%
Term Loan | Senior Secured Term Loan due 2025, net of original issue discount
Debt Instrument [Line Items]
Long-term debt	$ 397.0	$ 444.2

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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.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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