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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of long-term debt
Long-term debt consisted of the following:
 
December 31, 2017
 
December 31, 2016
 
(in millions)
6.5% Senior Notes due 2022
$
500.0

 
$
500.0

9.25% Senior Secured Notes due 2023
645.0

 
645.0

6.5% Senior Notes due 2021
2.2

 
2.2

Capital lease obligations
45.0

 
46.9

Total debt
1,192.2

 
1,194.1

Unamortized debt issuance cost
(12.2
)
 
(14.2
)
Unamortized debt discount
(13.5
)
 
(15.3
)
Current portion of capital lease obligations
(2.1
)
 
(1.8
)
Long-term debt, net of current portion
$
1,164.4

 
$
1,162.8
Schedule of future payments required under capital lease
Future payments required under capital lease at December 31, 2017 are as follows:
Year Ending December 31,
Capital Lease
 
(in millions)
2018
$
6.5

2019
6.5

2020
6.5

2021
6.5

2022
6.5

Thereafter
44.2

Total future payments
76.7

Less: amount representing interest
31.7

Present value of future minimum payments
45.0

 
 
Less: current portion
2.1

Long-term portion
$
42.9