Segments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Crestwood Equity Partners LP
Segment Reporting Information [Line Items]
Interest, Taxes, Depreciation and Amortization included in Earnings from Equity Method Investments	$ 2.6	$ 3.1
Crestwood Midstream Partners LP
Segment Reporting Information [Line Items]
Interest, Taxes, Depreciation and Amortization included in Earnings from Equity Method Investments	$ 2.6	$ 3.1

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