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

 
$
500.0

CRNF credit facility
125.0

 
125.0

Capital lease obligations
48.1

 
48.5

Total debt
673.1

 
673.5

Unamortized debt issuance cost

(6.0
)
 
(6.4
)
Current portion of long-term debt and capital lease obligations
(126.7
)
 
(126.4
)
Long-term debt, net of current portion
$
540.4

 
$
540.7