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Commitments and Contingencies - Leases and Unconditional Purchase Obligations (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
bbl / d
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
bbl / d
Jun. 30, 2016
USD ($)
Operating Leases        
Six Months Ending December 31, 2017 $ 3.7   $ 3.7  
2018 6.7   6.7  
2019 5.9   5.9  
2020 5.4   5.4  
2021 5.2   5.2  
Thereafter 7.2   7.2  
Operating leases 34.1   34.1  
Unconditional Purchase Obligations        
Six Months Ending December 31, 2017 86.4   86.4  
2018 135.0   135.0  
2019 129.0   129.0  
2020 111.4   111.4  
2021 100.6   100.6  
Thereafter 653.8   653.8  
Unconditional purchase obligations 1,216.2   1,216.2  
Unrecorded purchase agreements        
Lease expenses 1.7 $ 2.0 3.8 $ 4.2
Expenses related to long-term commitments 53.6 $ 34.0 108.9 $ 68.8
Petroleum transportation service agreement with TransCanada | CRRM        
Unrecorded purchase agreements        
Amount payable related to petroleum transportation service agreements $ 713.5   $ 713.5  
Term of agreement     14 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