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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2016
Debt Disclosure [Abstract]  
Schedule of long-term debt
Long-term debt consisted of the following:
 
June 30, 2016
 
December 31, 2015
 
(in millions)
6.5% Senior Notes due 2022
$
500.0

 
$
500.0

9.25% Senior Notes due 2023
645.0

 
—

6.5% Notes due 2021
4.2

 
—

CRNF credit facility
—

 
125.0

Capital lease obligations
47.7

 
48.5

Total debt
1,196.9

 
673.5

Unamortized debt issuance cost
(13.7
)
 
(6.4
)
Unamortized debt discount
(16.0
)
 
—

Current portion of long-term debt and capital lease obligations
(1.7
)
 
(126.4
)
Long-term debt, net of current portion
$
1,165.5

 
$
540.7