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Commitments and Contingencies - Leases and Unconditional Purchase Obligations (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
bbl / d
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
bbl / d
Sep. 30, 2015
USD ($)
Operating Leases        
Three Months Ending December 31, 2016 $ 2.0   $ 2.0  
2017 6.6   6.6  
2018 5.5   5.5  
2019 4.9   4.9  
2020 4.5   4.5  
Thereafter 10.7   10.7  
Operating leases 34.2   34.2  
Unconditional Purchase Obligations        
Three Months Ending December 31, 2016 46.4   46.4  
2017 137.2   137.2  
2018 129.2   129.2  
2019 126.4   126.4  
2020 109.4   109.4  
Thereafter 742.1   742.1  
Unconditional purchase obligations 1,290.7   1,290.7  
Unrecorded purchase agreements        
Lease expenses 2.0 $ 2.2 6.2 $ 6.5
Expenses related to long-term commitments 33.4 $ 36.1 103.3 $ 102.5
Petroleum transportation service agreement with TransCanada | CRRM        
Unrecorded purchase agreements        
Amount payable related to petroleum transportation service agreements $ 754.5   $ 754.5  
Term of agreement     15 years  
Minimum quantity of crude oil to be received per day (in barrels) | bbl / d 25,000   25,000  
Period over which minimum quantity of crude oil is receivable     20 years