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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Operating Leases        
Nine months ending, 2013 $ 2.4   $ 2.4  
2014 9.3   9.3  
2015 7.9   7.9  
2016 6.8   6.8  
2017 4.2   4.2  
Thereafter 8.2   8.2  
Operating leases 38.8   38.8  
Unconditional Purchase Obligations        
Nine months ending, 2013 85.3 [1]   85.3 [1]  
2014 113.1 [1]   113.1 [1]  
2015 101.4 [1]   101.4 [1]  
2016 94.2 [1]   94.2 [1]  
2017 93.0 [1]   93.0 [1]  
Thereafter 953.7 [1]   953.7 [1]  
Unconditional purchase obligations 1,440.7 [1]   1,440.7 [1]  
Lease expenses 2.4 1.2 7.0 3.9
Petroleum transportation service agreement with TransCanada | CRRM
        
Unrecorded purchase agreements        
Amount payable related to petroleum transportation service agreements $ 965.5   $ 965.5  
Term of agreement     18 years  
Minimum quantity of crude oil to be received per day (in barrels) 25,000   25,000  
Period over which minimum quantity of crude oil is receivable     20 years  
[1] This amount includes approximately $965.5 million payable ratably over eighteen 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.