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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating Leases      
2014 $ 9.5    
2015 7.9    
2016 6.9    
2017 4.2    
2018 3.0    
Thereafter 5.2    
Operating leases 36.7    
Unconditional Purchase Obligations      
2014 121.4 [1]    
2015 109.5 [1]    
2016 102.4 [1]    
2017 101.2 [1]    
2018 101.2 [1]    
Thereafter 882.7 [1]    
Unconditional purchase obligations 1,418.4 [1]    
Lease expenses 9.4 7.7 5.1
Unrecorded purchase agreements      
Expenses related to agreement 126.1 116.7 87.6
Petroleum transportation service agreement with TransCanada | CRRM
      
Unrecorded purchase agreements      
Amount payable related to petroleum transportation service agreements $ 973.0    
Term of agreement 17 years    
Minimum quantity of crude oil to be received per day (in barrels) 25,000    
Period over which minimum quantity of crude oil is receivable 20 years    
New Vitol Agreement | CRRM
      
Unrecorded purchase agreements      
Renewal term of agreement 1 year    
Number of days for prior notice of nonrenewal 180 days    
[1] This amount includes approximately $973.0 million payable ratably over seventeen years pursuant to petroleum transportation service agreements between CRRM and TransCanada Keystone Pipeline, LP ("TransCanada"). Under the agreements, CRRM receives transportation of at least 25,000 barrels per day of crude oil with a delivery point at Cushing, Oklahoma for a term of twenty years on TransCanada's Keystone pipeline system. CRRM began receiving crude oil under the agreements in the first quarter of 2011.