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Commitments and Contingencies - Leases and Unconditional Purchase Obligations (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
bbl / d
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Operating Leases      
2018 $ 7.4    
2019 6.5    
2020 5.9    
2021 5.3    
2022 4.8    
Thereafter 2.4    
Operating Leases 32.3    
Unconditional Purchase Obligations      
2018 165.0    
2019 124.3    
2020 100.6    
2021 89.8    
2022 84.7    
Thereafter 542.7    
Unconditional Purchase Obligations 1,107.1    
Unrecorded Unconditional Purchase Obligation [Line Items]      
Lease expenses 7.6 $ 8.2 $ 8.7
Expenses related to long-term commitments 209.4 $ 150.5 $ 135.9
CRRM | Petroleum transportation service agreement with TransCanada      
Unrecorded Unconditional Purchase Obligation [Line Items]      
Amount payable related to petroleum transportation service agreements $ 698.6    
Term of agreement 13 years    
Minimum quantity of crude oil to be received per day (in barrels per day) | bbl / d 25,000    
Period over which minimum quantity of crude oil is receivable 20 years