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Segments (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
Dec. 31, 2016
segment
Dec. 31, 2016
reporting_units
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Revenue, Major Customer [Line Items]            
Number of operating segments     3 3    
Concentration Risk, Percentage   10.00%        
Revenues $ 2,520.5       $ 2,632.8 $ 3,931.3
Tesoro            
Revenue, Major Customer [Line Items]            
Revenues 465.2          
Crestwood Equity Partners LP            
Revenue, Major Customer [Line Items]            
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization from Equity Method Investments 29.6       86.1 7.6
CMLP            
Revenue, Major Customer [Line Items]            
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization from Equity Method Investments 29.6       86.1 7.6
Revenues $ 2,520.5       $ 2,632.8 $ 3,917.5