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Long-Term Debt (Tables)
6 Months Ended
Jun. 30, 2015
Debt Disclosure [Abstract]  
Schedule of long-term debt
Long-term debt was as follows:
 
June 30, 2015
 
December 31, 2014
 
(in millions)
6.5% Senior Notes due 2022
$
500.0

 
$
500.0

CRNF credit facility
125.0

 
125.0

Capital lease obligations
49.2

 
49.9

Total debt
674.2

 
674.9

Current portion of long-term debt and capital lease obligations
(126.5
)
 
(1.4
)
Long-term debt, net of current portion
$
547.7

 
$
673.5