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Long-Term Debt (Tables)
 3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of long-term debt
Long-term debt consisted of the following:
 
March 31, 2018
 
December 31, 2017
 
(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
44.5

 
45.0

Total debt
1,191.7

 
1,192.2

Unamortized debt issuance cost
(11.7
)
 
(12.2
)
Unamortized debt discount
(13.0
)
 
(13.5
)
Current portion of capital lease obligations
(2.2
)
 
(2.1
)
Long-term debt, net of current portion
$
1,164.8

 
$
1,164.4