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Commitments and Contingencies - Leases and Unconditional Purchase Obligations (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
bbl / d
Mar. 31, 2016
USD ($)
Operating Leases    
Nine Months Ending December 31, 2017 $ 5.1  
2018 5.9  
2019 5.4  
2020 4.9  
2021 4.6  
Thereafter 6.8  
Operating leases 32.7  
Unconditional Purchase Obligations    
Nine Months Ending December 31, 2017 112.1  
2018 132.8  
2019 128.1  
2020 110.6  
2021 99.7  
Thereafter 648.9  
Unconditional purchase obligations 1,232.2  
Unrecorded purchase agreements    
Lease expenses 2.1 $ 2.2
Expenses related to long-term commitments 55.3 $ 33.2
Petroleum transportation service agreement with TransCanada | CRRM    
Unrecorded purchase agreements    
Amount payable related to petroleum transportation service agreements $ 720.7  
Term of agreement 14 years  
Minimum quantity of crude oil to be received per day (in barrels) | bbl / d 25,000  
Period over which minimum quantity of crude oil is receivable 20 years