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Commitments and Contingencies - Leases and Unconditional Purchase Obligations (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
bbl / d
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
bbl / d
Jun. 30, 2015
USD ($)
Operating Leases        
Six Months Ending December 31, 2016 $ 4.2   $ 4.2  
2017 6.6   6.6  
2018 4.9   4.9  
2019 3.1   3.1  
2020 2.4   2.4  
Thereafter 4.8   4.8  
Operating leases 26.0   26.0  
Unconditional Purchase Obligations        
Six Months Ending December 31, 2016 92.8   92.8  
2017 134.0   134.0  
2018 126.2   126.2  
2019 125.3   125.3  
2020 109.7   109.7  
Thereafter 737.3   737.3  
Unconditional purchase obligations 1,325.3   1,325.3  
Unrecorded purchase agreements        
Lease expenses 2.0 $ 2.1 4.2 $ 4.3
Expenses related to long-term commitments 34.0 $ 34.3 68.8 $ 66.5
Petroleum transportation service agreement with TransCanada | CRRM        
Unrecorded purchase agreements        
Amount payable related to petroleum transportation service agreements $ 770.0   $ 770.0  
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