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Commitments and Contingencies (Details 1)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
bbl / d
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Operating Leases      
2017 $ 6.6    
2018 5.6    
2019 5.0    
2020 4.6    
2021 4.4    
Thereafter 6.8    
Operating leases 33.0    
Unconditional Purchase Obligations      
2017 149.5    
2018 129.3    
2019 126.4    
2020 109.0    
2021 97.4    
Thereafter 639.7    
Unconditional purchase obligations 1,251.3    
Unrecorded Unconditional Purchase Obligation [Line Items]      
Lease expenses 8.2 $ 8.7 $ 9.3
Long-Term commitment expense 150.5 $ 135.9 $ 137.8
CRRM | Petroleum transportation service agreement with TransCanada      
Unrecorded Unconditional Purchase Obligation [Line Items]      
Amount payable related to petroleum transportation service agreements $ 733.7    
Term of agreement 14 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