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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]  
Schedule of long-term debt
Long-term debt consisted of the following:
 
June 30, 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
46.0

 
46.9

Total debt
1,193.2

 
1,194.1

Unamortized debt issuance cost
(13.2
)
 
(14.2
)
Unamortized debt discount
(14.4
)
 
(15.3
)
Current portion of capital lease obligations
(2.0
)
 
(1.8
)
Long-term debt, net of current portion
$
1,163.6

 
$
1,162.8