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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Debt and Financing - Schedule of Debt and Additional Information (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($)	Mar. 31, 2018	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Par Value	$ 865.0
Discount	(6.5)
Debt Issuance Costs	(6.2)
Book Value	852.3
Book Value, Current Maturities	(18.4)		$ (20.7)
Par Value, Excluding Current Maturities	846.6
Premium (Discount)	(6.5)
Book Value, Excluding Current Maturities	833.9		854.2
Book Value
Debt Instrument [Line Items]
Long-term debt, fair value	852.3		874.9
Fair value
Debt Instrument [Line Items]
Long-term debt, fair value	860.5		850.7
2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Total cash and cash equivalents and Managed Accessibility	156.8		203.8
Managed Accessibility	39.3		1.2
Changes to restricted cash	0.0		(25.0)
Term Loan
Debt Instrument [Line Items]
Par Value	558.1
Discount	(6.5)
Debt Issuance Costs	(5.6)
Book Value	546.0
Par Value, Current Maturities	(14.3)
Discount, Current Maturities	0.0
Deferred Issuance Costs, Current	0.0
Book Value, Current Maturities	$ (14.3)
Average Effective Interest Rate	11.30%
Term Loan \| Book Value
Debt Instrument [Line Items]
Long-term debt, fair value	$ 546.0		559.4
Term Loan \| Fair value
Debt Instrument [Line Items]
Long-term debt, fair value	555.0		546.0
ABL Facility \| 2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Par Value	0.0
Discount	0.0
Debt Issuance Costs	0.0
Book Value	0.0
Line of credit facility, total cash and availability	81.6
Secured Second A&R CDA
Debt Instrument [Line Items]
Par Value	26.8
Discount	0.0
Debt Issuance Costs	(0.1)
Book Value	$ 26.7
Average Effective Interest Rate	8.00%
Unsecured Second A&R CDA
Debt Instrument [Line Items]
Par Value	$ 46.7
Discount	0.0
Debt Issuance Costs	(0.2)
Book Value	46.5
Par Value, Current Maturities	(1.5)
Discount, Current Maturities	0.0
Deferred Issuance Costs, Current	0.0
Book Value, Current Maturities	$ (1.5)
Average Effective Interest Rate	8.00%
Lease financing obligations
Debt Instrument [Line Items]
Par Value	$ 233.4
Discount	0.0
Debt Issuance Costs	(0.3)
Book Value	233.1
Par Value, Current Maturities	(2.6)
Discount, Current Maturities	0.0
Deferred Issuance Costs, Current	0.0
Book Value, Current Maturities	$ (2.6)
Average Effective Interest Rate	16.50%
Lease financing obligations \| Book Value
Debt Instrument [Line Items]
Long-term debt, fair value	$ 233.1		242.2
Lease financing obligations \| Fair value
Debt Instrument [Line Items]
Long-term debt, fair value	232.4		234.7
Other Debt Obligations \| Book Value
Debt Instrument [Line Items]
Long-term debt, fair value	73.2		73.3
Other Debt Obligations \| Fair value
Debt Instrument [Line Items]
Long-term debt, fair value	$ 73.1		$ 70.0
Term Loan Agreement
Debt Instrument [Line Items]
Maximum Total Leverage Ratio, June 30, 2019	3.25
Maximum Total Leverage Ratio, September 30, 2019	3.25
Maximum Total Leverage Ratio, December 31, 2019	3.00
Maximum Total Leverage Ratio, March 31, 2020	3.00
Maximum Total Leverage Ratio, June 30, 2020	3.00
Maximum Total Leverage Ratio, September 30, 2020	2.75
Maximum Total Leverage Ratio, December 31, 2020	2.75
Maximum Total Leverage Ratio, March 31, 2021	2.75
Maximum Total Leverage Ratio, June 30, 2021 and thereafter	2.50
Total leverage ratio		3.12
London Interbank Offered Rate (LIBOR) \| Term Loan
Debt Instrument [Line Items]
Floor interest rate	1.00%
Basis spread on variable rate	8.50%