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Long-Term Debt (Narrative) (Details) - USD ($)	1 Months Ended		12 Months Ended
Long-Term Debt (Narrative) (Details) - USD ($)	Apr. 30, 2019	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Apr. 09, 2019	Apr. 08, 2019
Debt Instrument [Line Items]
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries			$ 2,099,300,000
Gains (Losses) on Extinguishment of Debt			0	$ (900,000)	$ (37,700,000)
Debt Issuance Costs, Net			29,100,000	26,400,000
CMLP
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt			$ 0	(900,000)	(37,700,000)
Revolving Loan Facility \| CMLP
Debt Instrument [Line Items]
Debt Instrument, Term			5 years
Credit agreement outstanding carrying value			$ 1,250,000,000	1,500,000,000
Crestwood Midstream Revolver
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt			$ 900,000
2023 Senior Notes \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage			6.25%
2023 Senior Notes \| Crestwood Midstream 2022 senior unsecured notes
Debt Instrument [Line Items]
Carrying amount			$ 700,000,000.0	700,000,000.0
2023 Senior Notes \| Crestwood Midstream 2022 senior unsecured notes \| CMLP
Debt Instrument [Line Items]
Carrying amount			695,100,000	693,600,000
2025 Senior Notes \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage		5.75%
2025 Senior Notes \| Crestwood Midstream 2019 Senior Notes \| CMLP
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		$ 492,000,000
2025 Senior Notes \| Crestwood Midstream 2022 senior unsecured notes
Debt Instrument [Line Items]
Carrying amount			500,000,000.0	500,000,000.0
2025 Senior Notes \| Crestwood Midstream 2022 senior unsecured notes \| CMLP
Debt Instrument [Line Items]
Carrying amount			494,400,000	493,400,000
2027 Senior Notes \| CMLP
Debt Instrument [Line Items]
Carrying amount			592,100,000	0
2027 Senior Notes \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Carrying amount	$ 600,000,000		600,000,000.0	0
Interest rate, stated percentage	5.625%
2027 Senior Notes \| Crestwood Midstream 2019 Senior Notes \| CMLP
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 591,100,000
Crestwood Midstream Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Additional Potential Capacity			350,000,000.0
Line of Credit Facility, Current Borrowing Capacity			350,000,000.0
Crestwood Midstream Credit Facility \| Minimum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Amount			0.0025
Crestwood Midstream Credit Facility \| Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Amount			$ 0.0045
Senior Notes, 2022
Debt Instrument [Line Items]
Debt Issuance Costs, Net					6,800,000
Repayments of Senior Debt					457,800,000
Senior Notes, 2022 \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities					1,000,000.0
Senior Notes, 2020
Debt Instrument [Line Items]
Repayments of Senior Debt					349,900,000
Senior Notes, 2020 \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities					$ 5,100,000
Crestwood Midstream Revolver
Debt Instrument [Line Items]
Consolidated leverage ratio, maximum			5.50
Crestwood Midstream Revolver \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement outstanding carrying value			$ 557,000,000.0	578,200,000
Letters of credit outstanding			$ 31,700,000	$ 68,000,000.0
Total funded debt to consolidated EBITDA			4.13
Consolidated EBITDA to consolidated interest expense			4.47
Senior Secured Leverage Ratio			0.98
Weighted average interest rate			4.00%	4.79%
Unused borrowing capacity			$ 661,300,000
Interest coverage ratio, minimum			2.50
Senior Secured Leverage Ratio, maximum			3.75
Line of Credit Facility, Increase (Decrease), Net	$ 250,000,000
Crestwood Midstream Revolver \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Weighted average interest rate			3.96%	4.63%
Crestwood Midstream Revolver \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Weighted average interest rate			6.00%	6.75%
Crestwood Midstream Revolver \| Bridge Loan
Debt Instrument [Line Items]
Credit agreement outstanding carrying value			$ 25,000,000.0
Obligations Under Noncompetition Agreements And Notes To Former Owners Of Businesses Acquired \| CMLP
Debt Instrument [Line Items]
Total payments due			700,000	$ 1,700,000
Obligations under noncompete agreements, unamortized discount			$ 100,000	$ 200,000
Obligations Under Noncompetition Agreements And Notes To Former Owners Of Businesses Acquired \| Minimum \| CMLP
Debt Instrument [Line Items]
Inputed interest			5.02%
Obligations Under Noncompetition Agreements And Notes To Former Owners Of Businesses Acquired \| Maximum \| CMLP
Debt Instrument [Line Items]
Inputed interest			6.75%
Federal Funds Rate \| Revolving Credit Facility \| Crestwood Midstream Revolver
Debt Instrument [Line Items]
Variable interest rate			0.50%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Credit Facility \| Minimum
Debt Instrument [Line Items]
Variable interest rate			1.50%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Credit Facility \| Maximum
Debt Instrument [Line Items]
Variable interest rate			2.50%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Revolver
Debt Instrument [Line Items]
Variable interest rate			1.00%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Revolver \| Minimum
Debt Instrument [Line Items]
Variable interest rate			0.50%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Revolver \| Maximum
Debt Instrument [Line Items]
Variable interest rate			1.50%
Jackalope Gas Gathering Services, LLC
Debt Instrument [Line Items]
Equity Interest	50.00%		50.00%
Equity method ownership percentage	50.00%		0.00%			50.00%	50.00%