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Segments (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
Dec. 31, 2017
segment
Dec. 31, 2017
reporting_units
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Revenue, Major Customer [Line Items]            
Number of operating segments     3 3    
Concentration Risk, Percentage   10.00%     10.00% 10.00%
Revenues $ 3,880.9       $ 2,520.5 $ 2,632.8
Crestwood Equity Partners LP            
Revenue, Major Customer [Line Items]            
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization from Equity Method Investments 32.5       29.6 86.1
CMLP            
Revenue, Major Customer [Line Items]            
Revenues $ 3,880.9       $ 2,520.5 $ 2,632.8