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Long-Term Debt (Tables)
3 Months Ended
Mar. 31, 2014
Debt Disclosure [Abstract]  
Schedule of long-term debt
Long-term debt was as follows:

 
March 31, 2014
 
December 31, 2013
 
(in millions)
6.5% Senior Notes due 2022
$
500.0

 
$
500.0

CRNF credit facility
125.0

 
125.0

Capital lease obligations
49.6

 
49.9

Long-term debt
$
674.6

 
$
674.9