Crestwood Equity Partners (CEQP) 10-Q 8 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014
Entity Information [Line Items]	'
Document Type	'10-Q
Amendment Flag	'false
Document Period End Date	31-Mar-14
Document Fiscal Year Focus	'2014
Document Fiscal Period Focus	'Q1
Trading Symbol	'CEQP
Entity Registrant Name	'Crestwood Equity Partners LP
Entity Central Index Key	'0001136352
Current Fiscal Year End Date	'--12-31
Entity Filer Category	'Large Accelerated Filer
Entity Common Stock, Shares Outstanding	0

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets	'	'
Cash and cash equivalents	$7.70	$5.20
Accounts receivable	364.3	412.6
Inventory	39.8	73.6
Assets from price risk management activities	10.1	14.5
Prepaid expenses and other current assets	29.4	16.1
Total current assets	451.3	522
Property, plant and equipment (Note 3)	4,183.70	4,108.70
Less: accumulated depreciation and depletion	245.3	203.4
Property, plant and equipment, net	3,938.40	3,905.30
Intangible assets (Note 3)	1,471.20	1,466.40
Less: accumulated amortization	132.9	106
Intangible assets, net	1,338.30	1,360.40
Goodwill	2,548.60	2,552.20
Investment in unconsolidated affiliates (Note 5)	171.1	151.4
Other assets	32.8	31.9
Total assets	8,480.50	8,523.20
Current liabilities:	'	'
Accounts payable	317.4	379
Accrued expenses and other liabilities	183.5	177.1
Liabilities from price risk management activities	6	34.9
Current portion of long-term debt (Note 9)	14	5.1
Total current liabilities	520.9	596.1
Long-term debt, less current portion (Note 9)	2,377.30	2,260.90
Other long-term liabilities	140.6	140.4
Deferred income taxes	13.4	17.2
Partners’ capital (Note 10):	'	'
Partners’ capital (186,521,737 and 185,274,279 limited partner units issued and outstanding at March 31, 2014 and December 31, 2013)	815.1	831.6
Partners' Capital	815.1	831.6
Partners' Capital Attributable to Noncontrolling Interest	4,613.20	4,677
Total partners’ capital	5,428.30	5,508.60
Total liabilities and partners’ capital	$8,480.50	$8,523.20

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical)	Mar. 31, 2014	Dec. 31, 2013
Common units, issued	186,521,737	185,274,279
Common units, outstanding	186,521,737	185,274,279

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenues:	'	'
Gathering and processing	$78.60	$46.80
Storage and transportation	51	0
NGL and crude services	841.1	0
Related party (Note 13)	0.9	25.6
Total revenue	971.6	72.4
Costs of product/services sold (excluding depreciation, amortization and accretion as shown below):	'	'
Gathering and processing	7.7	6.7
Storage and transportation	6.8	0
NGL and crude services	760.5	0
Related party (Note 13)	11	6.8
Cost of product/services sold	786	13.5
Expenses:	'	'
Operations and maintenance	44.1	13
General and administrative	27.9	7.8
Depreciation, amortization and accretion	66.3	22.4
Total Expenses	138.3	43.2
Gain on long-lived assets	0.5	0
Loss on contingent consideration (Note 12)	-2.1	0
Operating income	45.7	15.7
Loss from unconsolidated affiliates, net	-0.1	0
Interest and debt expense, net	-31.7	-11.4
Other income	0.1	0
Income before income taxes	14	4.3
Provision for income taxes	0.8	0.4
Net income	13.2	3.9
Net loss attributable to non-controlling partners	6.4	1.2
Net income attributable to Crestwood Equity Partners LP	19.6	5.1
Subordinated unitholders' interest in net income	0.5	0.6
Common unitholders' interest in net income	$19.10	$4.50
Net income per limited partner unit:	'	'
Basic (dollars per unit)	0.11	0.13
Diluted (dollars per unit)	0.11	0.13
Weighted-average limited partners’ units outstanding (in thousands):	'	'
Basic (units)	181,885	35,103
Dilutive (units)	4,388	4,388
Diluted (units)	186,273	39,491

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net income (loss)	$13.20	$3.90
Change in Suburban Propane Partners, L.P. units (Note 10)	-0.8	0
Comprehensive income (loss)	$12.40	$3.90

Consolidated_Statement_of_Part

Consolidated Statement of Partners' Capital (USD $)	Total	Limited Partners	Non-Controlling Partners	Partners' Capital [Member]
In Millions, unless otherwise specified
Balance at December 31, 2013 at Dec. 31, 2013	$831.60	$831.60	$4,677	$5,508.60
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Issuance of preferred equity of subsidiary	'	0	12.3	12.3
Change in invested capital from Legacy Inergy, net of debt (Note 4)	'	-10.3	0	-10.3
Unit-based compensation charges	'	1	4.4	5.4
Taxes paid for unit-based compensation vesting	'	-0.4	0	-0.4
Distributions to partners	'	-25.6	-74.1	-99.7
Change in Suburban Propane Partners, L.P. units	-0.8	-0.8	0	-0.8
Net income (loss)	13.2	19.6	-6.4	13.2
Balance at March 31, 2014 at Mar. 31, 2014	$815.10	$815.10	$4,613.20	$5,428.30

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Operating activities	'	'
Net income	$13.20	$3.90
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, amortization and accretion	66.3	22.4
Amortization of debt-related deferred costs, discounts and premiums	1.9	1.1
Market adjustment on interest rate swaps	-0.6	0
Unit-based compensation charges	5.4	0.6
Gain on long-lived assets	-0.5	0
Loss on contingent consideration	2.1	0
Loss from unconsolidated affiliates, net	0.1	0
Deferred income taxes	-3.8	0
Other	0.2	0.1
Changes in operating assets and liabilities, net of effects from acquisitions	-12	6
Net cash provided by operating activities	72.3	34.1
Investing activities	'	'
Acquisitions, net of cash acquired (Note 4)	-12.1	0
Purchases of property, plant and equipment	-72.8	-24.3
Investment in unconsolidated affiliates	-19.8	0
Net cash used in investing activities	-104.7	-24.3
Financing activities	'	'
Proceeds from the issuance of long-term debt	496.4	199.5
Principal payments on long-term debt	-372.6	-157
Payments on capital leases	-1.1	-1
Payments for debt related deferred costs	0	-0.1
Distributions to partners	-25.6	-4.1
Distributions paid to non-controlling partners	-74.1	-21
Distributions for additional interest in Crestwood Marcellus Midstream LLC	0	-129
Net proceeds from issuance of Crestwood Midstream Partners LP common units	0	103.5
Proceeds from issuance of preferred equity of subsidiary, net	12.3	0
Taxes paid for unit-based compensation vesting	-0.4	-0.7
Net cash provided by (used in) financing activities	34.9	-9.9
Net increase (decrease) in cash	2.5	-0.1
Cash at beginning of period	5.2	0.1
Cash at end of period	7.7	0
Supplemental schedule of noncash investing and financing activities	'	'
Net change to property, plant and equipment through accounts payable and accrued expenses	($3.40)	$1.60

Business_Description

Business Description	3 Months Ended
	Mar. 31, 2014
Disclosure Partnership Organization And Basis Of Presentation Narrative [Abstract]	'
Business Description	'
	Business Description
	Crestwood Equity Partners LP (the Company or Crestwood) is a publicly-traded (NYSE: CEQP) Delaware limited partnership that provides midstream solutions to customers in the crude oil, natural gas liquids (NGLs) and natural gas sectors of the energy industry. We are engaged primarily in the gathering, processing, storage and transportation of natural gas and NGLs, the marketing of NGLs, and the gathering, storage and transportation of crude oil.
	As of March 31, 2014, our general partner, Crestwood Equity GP LLC, owns our non-economic general partnership interest. Our general partner is indirectly owned by Crestwood Holdings LLC (Crestwood Holdings), which is substantially owned and controlled by First Reserve Management, L.P. (First Reserve) and which owns approximately 27% of our common units and 4,387,889 subordinated units convertible into common units as of March 31, 2014.
	We own the non-economic general partnership interest of Crestwood Midstream Partners LP (Crestwood Midstream) and, consequently, manage and control Crestwood Midstream. As of March 31, 2014, we also own approximately 4% of Crestwood Midstream’s limited partnership interests and 100% of its incentive distribution rights (IDRs), which entitle us to receive 50% of all distributions paid by Crestwood Midstream in excess of its initial quarterly distribution of $0.37 per common unit.
	Our financial statements reflect three operating and reporting segments, including:
	•	Gathering and Processing: our gathering and processing (G&P) operations provide natural gas gathering, processing, treating, compression, transportation services and sales of natural gas and the delivery of NGLs to producers in unconventional shale plays and tight-gas plays in West Virginia, Wyoming, Texas, Arkansas, New Mexico and Louisiana. This segment primarily includes our rich gas gathering systems and processing plants in the Marcellus, Powder River Basin (PRB) Niobrara, Barnett, and Permian Shale plays, and our dry gas gathering systems in the Barnett, Fayetteville, and Haynesville Shale plays;
	•	Storage and Transportation: our storage and transportation operations provide regulated natural gas storage and transportation services to producers, utilities and other customers. This segment primarily includes our natural gas storage facilities (Stagecoach, Thomas Corners, Steuben, Seneca Lake and Tres Palacios) in New York and Texas, and our natural gas transmission facilities (the North-South Facilities, the MARC I Pipeline and the East Pipeline) in New York and Pennsylvania; and
	•	NGL and Crude Services: our NGL and crude services operations provide gathering, storage, transportation, and marketing services to producers, refiners, marketers and other customers. This segment primarily includes our national NGL marketing, supply and logistics business (including our West Coast operations, Seymour NGL storage facility, and our fleet of terminals and over-the-road and rail transportation assets) and our integrated Bakken crude oil footprint in North Dakota, which consists of (i) the COLT Hub, a crude oil rail loading and storage terminal, (ii) the Arrow crude oil, natural gas and water gathering systems, and (iii) our fleet of over-the-road crude and produced water transportation assets. This segment also includes our Bath storage facility, an NGL underground storage facility in New York, and US Salt, a solution-mining and salt production company in New York.
	We own and operate the Tres Palacios natural gas storage facility and a national NGL marketing, supply and logistics business (including our West Coast NGL processing and fractionation facility, Seymour NGL storage facility, terminals and transportation fleet). All of our other consolidated assets are owned by or through Crestwood Midstream.
	On October 7, 2013, we changed our name from Inergy, L.P. to Crestwood Equity Partners LP. Unless otherwise indicated, references in this report to “we,” “us,” “our,” “ours,” “our company,” the “partnership,” the “Company,” “Crestwood,” and similar terms refer to either Crestwood Equity Partners LP itself or Crestwood Equity Partners LP and its consolidated subsidiaries, as the context requires. Unless otherwise indicated, references to (i) the Crestwood Merger refers to the October 7, 2013 merger of the Company’s wholly-owned subsidiary with and into Legacy Crestwood, with Legacy Inergy continuing as the surviving legal entity; (ii) Legacy Inergy refers to either Inergy, L.P. itself or Inergy, L.P. and its consolidated subsidiaries prior to the Crestwood Merger, (iii) Inergy Midstream and NRGM refer to either Inergy Midstream, L.P. itself or Inergy Midstream, L.P. and its consolidated subsidiaries prior to the Crestwood Merger, (iv) Legacy Crestwood and Legacy CMLP refer to either Crestwood Midstream Partners LP itself or Crestwood Midstream Partners LP and its consolidated subsidiaries prior to the Crestwood Merger, and (v) Crestwood Midstream refers to Crestwood Midstream Partners LP and its consolidated subsidiaries following the Crestwood Merger. See Note 4 for additional information on the Crestwood Merger.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2014
Text Block [Abstract]	'
Summary of Significant Accounting Policies	'
	Summary of Significant Accounting Policies
	Basis of Presentation
	Our consolidated financial statements were originally the financial statements of Crestwood Gas Services GP, LLC (Legacy Crestwood GP), prior to being acquired by us on June 19, 2013. The acquisition of Legacy Crestwood GP was accounted for as a reverse acquisition under the purchase method of accounting in accordance with accounting standards for business combinations. The accounting for a reverse acquisition results in the legal acquiree (Legacy Crestwood GP) being the acquirer for accounting purposes. Although Legacy Crestwood GP was the acquiring entity for accounting purposes, we were the acquiring entity for legal purposes; consequently, the name on these financial statements was changed from Crestwood Gas Services GP, LLC to Crestwood Equity Partners LP.
	The financial information as of March 31, 2014, and for the three-month periods ended March 31, 2014 and 2013, is unaudited. The consolidated balance sheet as of December 31, 2013, was derived from the audited balance sheet filed in our 2013 Annual Report on Form 10-K. Our consolidated financial statements are prepared in accordance with US GAAP and include the accounts of all consolidated subsidiaries after the elimination of all intercompany accounts and transactions. In management’s opinion, all necessary adjustments to fairly present our results of operations, financial position and cash flows for the periods presented have been made and all such adjustments are of a normal and recurring nature. Beginning in the first quarter of 2014, we began recording our operating and administrative expenses as operations and maintenance expenses and general and administrative expenses. In addition, we also reclassified our income statement for the three months ended March 31, 2013 to reflect this change. This change had no impact on our previously reported net income, earnings per unit or partners' capital.
	The accompanying consolidated financial statements should be read in conjunction with our 2013 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on February 28, 2014.
	Significant Accounting Policies
	There were no material changes in our significant accounting policies from those described in our 2013 Annual Report on Form 10-K and no significant accounting pronouncements issued but not yet adopted as of March 31, 2014.

Certain_Balance_Sheet_Informat

Certain Balance Sheet Information	3 Months Ended
	Mar. 31, 2014
Balance Sheet Related Disclosures [Abstract]	'
Certain Balance Sheet Information	'
	Certain Balance Sheet Information
	Property, Plant and Equipment
	Property, plant and equipment consisted of the following at March 31, 2014 and December 31, 2013 (in millions):
		March 31,		December 31,
		2014		2013
	Gathering systems and pipelines	$	1,473.10	$	1,473.40
	Facilities and equipment	1,435.50		1,186.50
	Buildings, land, rights-of-way, storage contracts and easements	818.4		814.7
	Vehicles	40.4		35.8
	Construction in process	183.2		365.8
	Base gas	102		102
	Salt deposits	120.5		120.5
	Office furniture and fixtures	10.6		10
		4,183.70		4,108.70
	Less: accumulated depreciation and depletion	245.3		203.4
	Total property, plant and equipment, net	$	3,938.40	$	3,905.30
	Capital Leases. We have a compressor station, treating facility and certain auto and other leases which are accounted for as capital leases. Our compressor station and treating facility leases are reflected in facilities and equipment and the auto and other leases are reflected in vehicles in the above table. We had capital lease assets of $6.3 million and $5.0 million included in property, plant and equipment, net at March 31, 2014 and December 31, 2013.
	Intangible Assets
	Intangible assets consisted of the following at March 31, 2014 and December 31, 2013 (in millions):
		March 31,		December 31,
		2014		2013
	Customer accounts	$	580.8	$	576.9
	Covenants not to compete	7.9		7
	Gas gathering, compression and processing contracts	750.2		750.2
	Acquired storage contracts	43.5		43.5
	Trademarks	33.5		33.5
	Deferred financing and other costs	55.3		55.3
		1,471.20		1,466.40
	Less: accumulated amortization	132.9		106
	Total intangible assets, net	$	1,338.30	$	1,360.40
	Accrued Expenses and Other Liabilities
	Accrued expenses and other liabilities consisted of the following at March 31, 2014 and December 31, 2013 (in millions):
		March 31, 2014		December 31, 2013
	Accrued expenses	$	42.1	$	40.3
	Accrued property taxes	4.8		9.4
	Accrued product purchases payable	1.9		1.6
	Tax payable	11.9		14.8
	Interest payable	28.8		16.7
	Accrued additions to property, plant and equipment	55.5		58.2
	Commitments and contingent liabilities (Note 12)	33.5		31.4
	Capital leases	2.2		2.6
	Deferred revenue	2.8		2.1
	Total accrued expenses and other liabilities	$	183.5	$	177.1

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
Acquisitions	'
	Acquisitions
	2014 Acquisition
	Crude Transportation Acquisition (Bakken)
	On March 21, 2014, Crestwood Midstream purchased substantially all of the operating assets of Red Rock Transportation Inc. (Red Rock) for approximately $14.1 million, comprised of $12.1 million paid at closing plus deferred payments of $2.0 million. Red Rock is a trucking operation located in Watford City, North Dakota which provides crude oil and produced water hauling services to the oilfields of western North Dakota and eastern Montana. The acquired assets include a fleet of approximately 56 trailer tanks, 22 double bottom body tanks and 44 tractors with more than 25,000 barrels per day of crude hauling capacity. We allocated approximately $10.9 million of the purchase price to property, plant and equipment and intangible assets and approximately $3.2 million to goodwill. These assets are included in our NGL and crude services segment.
	2013 Acquisitions
	Crestwood Merger
	As described in Note 2, the acquisition of Legacy Crestwood GP was accounted for as a reverse acquisition under the purchase method of accounting in accordance with the accounting standards for business combinations. This accounting treatment requires the accounting acquiree (CEQP) to have its assets and liabilities stated at fair value as well as any other purchase accounting adjustments as of June 19, 2013, the date of the acquisition. The fair value of CEQP was calculated based on the consolidated enterprise fair value of CEQP as of June 19, 2013. This consolidated enterprise fair value considered the discounted future cash flows of the Legacy Inergy and Inergy Midstream operations and the stock prices of CEQP and NRGM, the value of their outstanding senior notes based on quoted market prices for same or similar issuances and the value of their outstanding floating rate debt.
	The following table summarizes the preliminary fair values of the assets acquired and liabilities assumed at the merger date (in millions):
		Current Estimate		Preliminary Estimate (a)		Adjustment Based on Revised Valuation Report
	Current assets	$	224.5	$	224.5	$	—
	Property, plant and equipment	2,088.10		2,088.20		(0.1		)
	Intangible assets	337.5		337.5		—
	Other assets	12.7		12.7		—
	Total identifiable assets acquired	2,662.80		2,662.90		(0.1		)
	Current liabilities	207.6		207.5		0.1
	Long-term debt	1,079.30		1,079.30		—
	Other long-term liabilities	146.6		146.6		—
	Total liabilities assumed	1,433.50		1,433.40		0.1
	Net identifiable assets acquired	1,229.30		1,229.50		(0.2		)
	Goodwill	2,139.80		2,149.90		(10.1		)
	Net assets acquired	$	3,369.10	$	3,379.40	$	(10.3	)
	(a)    Preliminary amount recorded as of December 31, 2013.
	The changes from the preliminary estimate were based on additional valuation information obtained on the components that comprise the enterprise fair value of Legacy Inergy as well as certain of our storage and transportation assets and obligations, primarily related to our Tres Palacios storage operations.  The impact of these adjustments on depreciation and amortization expense was not material to our results of operations for the three months ended March 31, 2014. These revised estimates continue to be preliminary and are subject to material change pending the final valuation of these assets and liabilities.
	Of the $2,139.8 million of goodwill, $1,411.2 million is reflected in our NGL and crude services segment and $728.6 million is reflected in our storage and transportation segment. Goodwill recognized relates primarily to synergies and new expansion opportunities expected to result from the combination of Legacy Crestwood and Inergy Midstream.  The purchase price allocation has been prepared on a preliminary basis pending receipt of a final valuation report and is subject to material change.
	Arrow Acquisition
	On November 8, 2013, Crestwood Midstream acquired Arrow Midstream Holdings, LLC (Arrow) for approximately $750 million, subject to customary capital expenditure, working capital adjustments of approximately $12.8 million, representations, warranties and indemnifications.  The acquisition was consummated by merging a wholly-owned subsidiary of Crestwood Midstream with and into Arrow (the Arrow Acquisition), with Arrow continuing as the surviving entity and a wholly-owned subsidiary of Crestwood Midstream. The base merger consideration consisted of $550 million in cash and 8,826,125 common units of Crestwood Midstream issued to the sellers, subject to adjustment for standard working capital provisions.
	The following table summarizes the preliminary fair values of the assets acquired and liabilities assumed at the acquisition date (in millions):
	Current assets	$	191.1
	Property, plant and equipment	400.2
	Intangible assets	323.4
	Other assets	19.5
	Total identifiable assets acquired	934.2
	Current liabilities	215.3
	Assets retirement obligations	1.2
	Other long-term liabilities	3.7
	Total liabilities assumed	220.2
	Net identifiable assets acquired	714
	Goodwill	48.8
	Net assets acquired	$	762.8
	The $48.8 million of goodwill is reflected in our NGL and crude services segment. Goodwill recognized relates primarily to anticipated operating synergies between the assets acquired and our existing assets.  During the three months ended March 31, 2014, we also recognized approximately $4.6 million of transaction-related fees primarily related to services provided in 2013 related to this acquisition. The purchase price allocation has been prepared on a preliminary basis pending receipt of a final valuation report and is subject to material change.
	Unaudited Pro Forma Financial Information
	The following table represents the pro forma consolidated statement of operations as if the Legacy Inergy reverse acquisition and the Arrow Acquisition had been included in our consolidated results for the three-month period ended March 31, 2013 (in millions, except per unit information):
	Revenues	$	811.3
	Net income	$	6.9
	Net income per limited partner unit(a):
	Basic	$	0.06
	Diluted	$	0.06
	(a) Basic and diluted net income per limited partner unit for the three months ended March 31, 2013 were computed based on the presumption that the common and subordinated units issued to acquire Legacy Crestwood GP (the accounting predecessor) were outstanding for the entire period prior to the June 19, 2013 acquisition.
	These amounts have been calculated after applying our accounting policies and adjusting the results of the acquisitions to reflect the depreciation and amortization that would have been charged assuming the preliminary fair value adjustments to property, plant and equipment and intangible assets had been made at the beginning of the respective reporting period. The purchase price allocation for the reverse acquisition of Legacy Inergy and the Arrow Acquisition has been prepared on a preliminary basis pending final asset valuation and asset rationalization, and changes are expected when additional information becomes available. Accordingly, the purchase accounting adjustments made in connection with the development of the unaudited pro forma are preliminary and subject to change.

Investments_in_Unconsolidated_

Investments in Unconsolidated Affiliates (Notes)	3 Months Ended
	Mar. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]	'
Investments in Unconsolidated Affiliates	'
	Investments in Unconsolidated Affiliates
	Jackalope Gas Gathering Services, L.L.C.
	Crestwood Niobrara LLC (Crestwood Niobrara), our consolidated subsidiary, owns a 50% ownership interest in Jackalope Gas Gathering Services, L.L.C. (Jackalope) which we account for under the equity method of accounting. During the three months ended March 31, 2014, Crestwood Niobrara contributed $17.3 million to Jackalope to fund its construction projects.
	Our investment in Jackalope was $144.8 million and $127.2 million at March 31, 2014 and December 31, 2013. We have reflected the earnings from our investment in Jackalope in our consolidated statements of income, which includes our share of net earnings based on our ownership interest and other adjustments recorded by us as discussed below. During the three months ended March 31, 2014, our share of Jackalope’s net earnings was approximately $1.1 million. As of March 31, 2014, our investment balance in Jackalope exceeded our equity in the underlying net assets of Jackalope by approximately $56.0 million. We amortize and generally assess the recoverability of this amount based on the life of Jackalope’s gathering agreement with Chesapeake Energy Corporation (Chesapeake) and RKI Exploration and Production, LLC (RKI). The amortization is reflected as reduction of our earnings from unconsolidated affiliates, and during the three months ended March 31, 2014, we recorded amortization expense of approximately $0.8 million.
	Jackalope is required to make quarterly distributions of its available cash to its members based on their respective ownership percentage. During the three months ended March 31, 2014, Jackalope did not make any distributions to its members.
	Our Jackalope investment is included in our gathering and processing segment.
	Powder River Basin Industrial Complex, LLC
	Crestwood Crude Logistics LLC (Crude Logistics), our consolidated subsidiary, owns a 50% ownership interest in Powder River Basin Industrial Complex, LLC (PRBIC) which we account for under the equity method of accounting. During the three months ended March 31, 2014, Crude Logistics invested approximately $2.5 million in PRBIC to fund its construction projects.
	Our investment in PRBIC was $26.3 million and $24.2 million at March 31, 2014 and December 31, 2013. During the three months ended March 31, 2014, our share of PRBIC’s loss was approximately $0.4 million. As of March 31, 2014, our investment balance in PRBIC approximated our equity in the underlying net assets of PRBIC.
	PRBIC is required to make quarterly distributions of its available cash to its members based on their respective ownership percentage. During the three months ended March 31, 2014, PRBIC did not make any distributions to its members.
	Our PRBIC investment is included in our NGL and crude services segment.

Earnings_Per_Limited_Partner_U

Earnings Per Limited Partner Unit Earnings Per Limited Partner Unit (Notes)	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Earnings Per Limited Partner Unit	'
	Earnings Per Limited Partner Unit
	We own a non-economic general partnership interest and 100% of the IDRs in Crestwood Midstream. The general partner of Legacy Crestwood held general partner units and owned 100% of the IDRs of Legacy Crestwood. Our net income is allocated to the subordinated and limited partner unitholders based on their ownership percentage.
	We calculate basic net income per limited partner unit by utilizing the two class method. Diluted net income per limited partner unit is computed by dividing net income attributable to the limited partners by the weighted-average number of units outstanding and the effect of dilutive units granted in the acquisition of Legacy Crestwood GP. The weighted average number of units outstanding is calculated based on the presumption that the common and subordinated units issued to acquire Legacy Crestwood GP (the accounting predecessor) were outstanding for the entire period prior to the June 19, 2013 acquisition. There were no units excluded from our dilutive earnings per share as we did not have any anti-dilutive units for the three months ended March 31, 2014 and 2013.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements
	The accounting standard for fair value measurement establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The three levels of the fair value hierarchy are as follows:
	•	Level 1—Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 1 primarily consists of financial instruments such as exchange-traded derivatives, listed equities and US government treasury securities.
	•	Level 2—Pricing inputs are other than quoted prices in active markets included in Level 1, which are either directly or indirectly observable as of the reporting date. Level 2 includes those financial instruments that are valued using models or other valuation methodologies. These models are primarily industry-standard models that consider various assumptions, including quoted forward prices for commodities, time value, volatility factors, and current market and contractual prices for the underlying instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace. Instruments in this category include non-exchange-traded derivatives such as over the counter (“OTC”) forwards, options and physical exchanges.
	•	Level 3—Pricing inputs include significant inputs that are generally less observable from objective sources. These inputs may be used with internally developed methodologies that result in management’s best estimate of fair value.
	Cash and Cash Equivalents, Accounts Receivable and Accounts Payable
	As of March 31, 2014 and December 31, 2013, the carrying amounts of cash and cash equivalents, accounts receivable and accounts payable represent fair value based on the short-term nature of these instruments.
	Notes Payable and Other Obligations
	As of March 31, 2014 and December 31, 2013, the carrying value and fair value of our notes payable and other obligations are approximately the same due to the interest rates being materially consistent with the book value.
	Credit Facilities
	The fair value of our credit facilities approximates their carrying amounts as of March 31, 2014 and December 31, 2013, due primarily to the variable nature of the interest rates of the instruments, which is considered a Level 2 fair value measurement.
	Senior Notes
	We estimate the fair value of our senior notes primarily based on quoted market prices for the same or similar issuances (representing a Level 2 fair value measurement). The following table reflects the carrying value and fair value of the senior notes (in millions):
		March 31, 2014				December 31, 2013
		Carrying Amount		Fair		Carrying Amount		Fair
				Value				Value
	CEQP Senior Notes	$	11.4	$	11.6	$	11.4	$	11.6
	Crestwood Midstream 2022 Senior Notes	$	600	$	624	$	600	$	617.3
	Crestwood Midstream 2019 Senior Notes	$	351.2	$	381.5	$	351.2	$	379.3
	Crestwood Midstream 2020 Senior Notes	$	504.5	$	528.4	$	504.7	$	513.8
	Assets and Liabilities
	As of March 31, 2014, we held certain assets and liabilities that are required to be measured at fair value on a recurring basis, which include our derivative instruments related to heating oil, crude oil, NGLs and interest rates. Our derivative instruments consist of forwards, swaps, futures, physical exchanges and options.
	Certain of our derivative instruments are traded on the NYMEX. These instruments have been categorized as Level 1.
	Our derivative instruments also include OTC contracts, which are not traded on a public exchange. The fair values of these derivative instruments are determined based on inputs that are readily available in public markets or can be derived from information available in publicly quoted markets. These instruments have been categorized as Level 2.
	Our OTC options are valued based on the Black Scholes option pricing model that considers time value and volatility of the underlying commodity. The inputs utilized in the model are based on publicly available information as well as broker quotes. These options have been categorized as Level 2.
	The assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels.
	The following tables set forth by level within the fair value hierarchy, our assets and liabilities that were accounted for at fair value on a recurring basis at March 31, 2014 and December 31, 2013 (in millions):
		31-Mar-14
		Fair Value of Derivatives
		Level 1		Level 2		Level 3		Total		Netting			Total
										Agreements(a)
	Assets
	Assets from price risk management	$	0.1	$	10.2	$	—	$	10.3	$	(0.2	)	$	10.1
	SPH units	5.9		—		—		5.9		—			5.9
	Total assets at fair value	$	6	$	10.2	$	—	$	16.2	$	(0.2	)	$	16
	Liabilities
	Liabilities from price risk management	$	0.1	$	8.8	$	—	$	8.9	$	(2.9	)	$	6
	Interest rate swaps	—		3.7		—		3.7		—			3.7
	Total liabilities at fair value	$	0.1	$	12.5	$	—	$	12.6	$	(2.9	)	$	9.7
		31-Dec-13
		Fair Value of Derivatives
		Level 1		Level 2		Level 3		Total		Netting			Total
										Agreements(a)
	Assets
	Assets from price risk management	$	0.3	$	27.7	$	—	$	28	$	(13.5	)	$	14.5
	SPH units	6.7		—		—		6.7		—			6.7
	Total assets at fair value	$	7	$	27.7	$	—	$	34.7	$	(13.5	)	$	21.2
	Liabilities
	Liabilities from price risk management	$	0.1	$	39.5	$	—	$	39.6	$	(4.7	)	$	34.9
	Interest rate swaps	—		4.3		—		4.3		—			4.3
	Total liabilities at fair value	$	0.1	$	43.8	$	—	$	43.9	$	(4.7	)	$	39.2
	(a)	Amounts represent the impact of legally enforceable master netting agreements that allow us to settle positive and negative positions as well as cash collateral held or placed with the same counterparties.

Risk_Management

Risk Management	3 Months Ended
	Mar. 31, 2014
Risk Management - Notional Amounts and Terms of Companys Derivative Financial Instruments [Abstract]	'
Risk Management	'
	Risk Management
	We are exposed to certain market risks related to our ongoing business operations. These risks include exposure to changing commodity prices as well as fluctuations in interest rates. We utilize derivative instruments to manage our exposure to fluctuations in commodity prices, which is discussed below. We also periodically utilize derivative instruments to manage our exposure to fluctuations in interest rates, which is discussed in Note 9.
	Commodity Derivative Instruments and Price Risk Management
	Risk Management Activities
	We sell NGLs to energy related businesses and may use a variety of financial and other instruments including forward contracts involving physical delivery of NGLs. We will periodically enter into offsetting positions to economically hedge against the exposure our customer contracts create, however we do not designate these instruments as hedging instruments for accounting purposes. These instruments are marked to market with the changes in the market value reflected in costs of product/services sold. We attempt to balance our contractual portfolio in terms of notional amounts and timing of performance and delivery obligations. This balance in the contractual portfolio significantly reduces the volatility in costs of product/services sold related to these instruments.
	We had no derivatives identified as fair value hedges for accounting purposes in the three-month periods ended March 31, 2014 and 2013.
	Commodity Price and Credit Risk
	Notional Amounts and Terms
	The notional amounts and terms of our derivative financial instruments include the following at March 31, 2014 and December 31, 2013, respectively (in millions):
		31-Mar-14		31-Dec-13
		Fixed Price	Fixed Price	Fixed Price	Fixed Price
		Payor	Receiver	Payor	Receiver
	Propane, crude and heating oil (barrels)	4.4	4.5	5.6	6.8
	Natural gas (MMBTU’s)	0.1	0.1	—	—
	Notional amounts reflect the volume of transactions, but do not represent the amounts exchanged by the parties to the financial instruments. Accordingly, notional amounts do not reflect our monetary exposure to market or credit risks.
	All contracts subject to price risk had a maturity of 33 months or less; however, 96.3% of the contracts expire within 12 months.
	Credit Risk
	Inherent in our contractual portfolio are certain credit risks. Credit risk is the risk of loss from nonperformance by suppliers, customers or financial counterparties to a contract. We take an active role in managing credit risk and have established control procedures, which are reviewed on an ongoing basis. We attempt to minimize credit risk exposure through credit policies and periodic monitoring procedures as well as through customer deposits, letters of credit and entering into netting agreements that allow for offsetting counterparty receivable and payable balances for certain financial transactions, as deemed appropriate. The counterparties associated with assets from price risk management activities as of March 31, 2014 and December 31, 2013 were energy marketers and propane retailers, resellers and dealers.
	Certain of our derivative instruments have credit limits that require us to post collateral. The amount of collateral required to be posted is a function of the net liability position of the derivative as well as our established credit limit with the respective counterparty. If our credit rating were to change, the counterparties could require us to post additional collateral. The amount of additional collateral that would be required to be posted would vary depending on the extent of change in our credit rating as well as the requirements of the individual counterparty. The aggregate fair value of all commodity derivative instruments with credit-risk-related contingent features that are in a liability position at March 31, 2014 is $1.6 million for which we have posted less than $0.1 million of collateral in the normal course of business. In addition, we have posted $5.3 million of NYMEX margin deposits in the normal course of business. We have also received collateral of $1.7 million in the normal course of business. All collateral amounts have been netted against the asset or liability with the respective counterparty.

LongTerm_Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2014
Text Block [Abstract]	'
Long-Term Debt	'
	Long-Term Debt
	Long-term debt consisted of the following at March 31, 2014 and December 31, 2013 (in millions):
		March 31,		December 31,
		2014		2013
	CEQP Credit Facility	$	387.6	$	381
	CEQP Senior Notes	11.4		11.4
	Crestwood Midstream Revolver	532.1		414.9
	Crestwood Midstream 2019 Senior Notes	350		350
	Premium on Crestwood Midstream 2019 Senior Notes	1.2		1.2
	Crestwood Midstream 2020 Senior Notes	500		500
	Fair value adjustment of Crestwood Midstream 2020 Senior Notes	4.5		4.7
	Crestwood Midstream 2022 Senior Notes	600		600
	Other	4.5		2.8
	Total debt	2,391.30		2,266.00
	Less: current portion	14		5.1
	Total long-term debt	$	2,377.30	$	2,260.90
	We and our subsidiaries do not provide credit support or guarantee any amounts outstanding under the credit facility or notes of Crestwood Midstream. Crestwood Midstream and its subsidiaries do not provide credit support or guarantee any amounts outstanding under our credit facility or senior notes.
	CEQP Credit Facility
	We utilize a secured credit facility (the CEQP Credit Facility) with an aggregate revolving loan facility of $550 million due in July 2016, to fund working capital requirements, as a source of capital to fund capital expenditures and acquisitions and for general partnership purposes. All borrowings under the CEQP Credit Facility are generally secured by substantially all of our assets and the equity interests in all of our wholly owned subsidiaries.
	At March 31, 2014, the balance outstanding under the CEQP Credit Facility was $387.6 million and outstanding standby letters of credit amounted to $61.0 million. As a result, we had $101.4 million of remaining capacity under the revolving credit facility at March 31, 2014, subject to compliance with any applicable covenants under the facility. The interest rates of the CEQP Credit Facility are based on prime rate and LIBOR plus the applicable spreads, resulting in interest rates which were between 2.66% and 4.75% at March 31, 2014.
	The credit agreement governing the CEQP Credit Facility contains the following financial covenants:
	•	the ratio of our total funded debt (as defined in the credit agreement) to consolidated EBITDA (as defined in the credit agreement) for the four quarters most recently ended must be no greater than (i) 5.50 to 1.0 for the quarter ended March 31, 2014, and (ii) 4.75 to 1.0 for the quarter ended June 30, 2014 and all subsequent quarters.
	•	the ratio of our consolidated EBITDA to consolidated interest expense (as defined in the credit agreement), for the four quarters then most recently ended, must not be less than 2.50 to 1.0.
	At March 31, 2014, the total funded debt to consolidated EBITDA was approximately 4.23 to 1.0 and consolidated EBITDA to consolidated interest expense was approximately 7.51 to 1.0.
	At March 31, 2014, we were in compliance with the debt covenants in the CEQP Credit Facility. For additional information regarding our debt covenants, see our 2013 Annual Report on Form 10-K as filed with the SEC.
	We have entered into six interest rate swaps that mature in 2016 to reduce our exposure to variable interest payments due under the CEQP Credit Facility. These swap agreements require us to pay the counterparty an amount based on fixed rates from 0.84% to 2.52% due quarterly on an aggregate notional amount of $225.0 million. In exchange, the counterparty is required to make quarterly floating interest rate payments on the same date to us based on the three-month LIBOR applied to the same aggregate notional amount of $225.0 million. During the three months ended March 31, 2014, we recorded a gain of approximately $0.6 million associated with these interest rate swaps, which is reflected as a reduction of our interest and debt expenses, net on our consolidated statement of operations.
	CEQP Senior Notes
	At March 31, 2014, we had $11.4 million in outstanding senior notes, the majority of which mature on October 1, 2018 and have a coupon rate of 7%. The outstanding senior notes do not contain any financial covenants.
	Crestwood Midstream Revolver
	Crestwood Midstream has a five-year $1 billion senior secured revolving credit facility (the Crestwood Midstream Revolver), which is available to fund acquisitions, working capital and internal growth projects and for general partnership purposes. The Crestwood Midstream Revolver includes a sub-limit up to $25 million for same-day swing line advances and a sub-limit up to $250 million for letters of credit. Subject to limited exception, the credit facility is secured by substantially all of the equity interests and assets of Crestwood Midstream’s restricted domestic subsidiaries, and is joint and severally guaranteed by substantially all of its restricted domestic subsidiaries.
	At March 31, 2014, the balance outstanding on the Crestwood Midstream Revolver was $532.1 million and outstanding standby letters of credit amounted to $31.4 million. As a result, Crestwood Midstream had $436.5 million of remaining capacity under the revolving credit facility at March 31, 2014, subject to compliance with any applicable covenants under such facility. The weighted-average interest rate as of March 31, 2014 was 5.71%.
	Crestwood Midstream is required under its credit agreement to maintain a consolidated leverage ratio (as defined in its credit agreement) of not more than 5.00 (subject to, at its election, a consolidated net leverage ratio of not more than 5.50 to 1.0 during certain periods following certain material acquisitions as further described in its credit agreement) to 1.0 and an interest coverage ratio (as defined in its credit agreement) of not less than 2.50 to 1.0.
	At March 31, 2014, Crestwood Midstream elected to use a consolidated net leverage ratio of 5.50 to 1.0. The total funded debt to consolidated EBITDA was approximately 5.06 to 1.0 and consolidated EBITDA to consolidated interest expense was approximately 3.61 to 1.0 at March 31, 2014.
	Crestwood Midstream Senior Notes
	Crestwood Midstream has three series of senior unsecured notes outstanding, including (i) $350 million in aggregate principal amount of 7.75% Senior Notes due 2019 (the 2019 Senior Notes), (ii) $500 million in aggregate principal amount of 6.0% Senior Notes due 2020 (the 2020 Senior Notes), and (iii) $600 million in aggregate principal amount of 6.125% Senior Notes due 2012 (the 2022 Senior Notes, and together with the 2019 Senior Notes and 2020 Senior Notes, its Senior Notes). Crestwood Midstream's Senior Notes are guaranteed on a senior unsecured basis by all of its domestic restricted subsidiaries, subject to certain exceptions.
	At March 31, 2014, Crestwood Midstream was in compliance with all of its debt covenants applicable to the Crestwood Midstream Revolver and its Senior Notes. For additional information regarding the Crestwood Midstream debt covenants, see our 2013 Annual Report on Form 10-K as filed with the SEC.
	Other
	For a description of our non-interest bearing obligations due under noncompetition agreements and other note payable agreements, see our 2013 Annual Report on Form 10-K as filed with the SEC.

Partners_Capital

Partners' Capital	3 Months Ended
	Mar. 31, 2014
Partners' Capital Account, Distributions [Abstract]	'
Partners' Capital	'
	Partners’ Capital
	Distributions
	Distributions to Partners
	During the three months ended March 31, 2013, Legacy Crestwood GP paid cash distributions to its member of $4.1 million.
	A summary of our limited partner quarterly distributions for the three months ended March 31, 2014 is presented below:
	Three Months Ended March 31, 2014
	Record Date	Payment Date	Per Unit Rate		Cash Distributions
					(in millions)
	February 7, 2014	February 14, 2014	$	0.1375	$	25.6
	On April 24, 2014, we declared a distribution of $0.1375 per limited partner unit to be paid on May 15, 2014, to unitholders of record on May 8, 2014 with respect to the first quarter of 2014.
	Distributions to Non-Controlling Partners
	Crestwood Midstream paid cash distributions to its common unitholders of $74.1 million during the three months ended March 31, 2014. Legacy Crestwood paid cash distributions to its common unitholders of $21.0 million during the three months ended March 31, 2013.
	Other Partners’ Capital Transaction
	On January 8, 2013, Legacy Crestwood acquired Crestwood Holdings’ 65% membership interest in Crestwood Marcellus Midstream LLC for approximately $258.0 million, of which approximately $129.0 million was funded through the issuance of 6,190,469 Class D units and the issuance of 133,060 general partner units to the Legacy Crestwood general partner. We reflected the issuances of the Class D and general partner units as distributions for additional interest in Crestwood Marcellus Midstream LLC in our consolidated statements of cash flows for the three months ended March 31, 2013.
	In August 2012, Legacy Inergy contributed its retail propane operations to Suburban Propane Partners, L.P. (SPH).  In connection with this contribution, Legacy Inergy retained 142,004 SPH units which we mark to market each quarter.  The change in fair value is reflected in the consolidated statements of partners’ capital and the consolidated statements of comprehensive income.
	Preferred Equity of Subsidiary
	Crestwood Niobrara issued a preferred interest to a subsidiary of General Electric Capital Corporation and GE Structured Finance, Inc. (collectively, GE) in conjunction with the acquisition of its investment in Jackalope. The preferred interest is reflected as non-controlling interest in our consolidated financial statements. During the three months ended March 31, 2014, we allocated approximately $3.1 million of net income to the non-controlling interest, which was based on the overall return attributable to the preferred security.
	Crestwood Niobrara will fund 75% of future capital contributions to Jackalope through additional preferred interest issuances to GE (up to a maximum of an additional $41.6 million as of March 31, 2014), with the remainder to be funded through our capital contributions to Crestwood Niobrara. During the three months ended March 31, 2014, GE EFS made a capital contribution of $12.3 million to Crestwood Niobrara in exchange for an equivalent number of preferred units. Through March 31, 2014, GE has made capital contributions totaling $108.4 million.
	Crestwood Niobrara has the option to pay distributions to GE with cash or by issuing additional preferred units through the January 2015 distribution. During the three months ended March 31, 2014, Crestwood Niobrara issued 2,210,294 preferred units to GE in lieu of paying a cash distribution. Crestwood Midstream serves as the managing member of Crestwood Niobrara and, subject to certain restrictions, it has the ability to redeem GE’s preferred interest in either cash or Crestwood Midstream common units at an amount equal to the face amount of the preferred units plus an applicable return. On April 30, 2014, Crestwood Niobrara issued 2,536,010 preferred units to GE in lieu of paying a cash distribution.

LongTerm_Incentive_Plans_Notes

Long-Term Incentive Plans (Notes)	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]	'
Long-Term Incentive Plans	'
	Long-Term Incentive Plans
	Long-term incentive awards are granted under the Crestwood Equity Partners LP Long Term Incentive Plan (Crestwood LTIP) (formerly the Inergy Long Term Incentive Plan) and the Crestwood Midstream Partners LP Long Term Incentive Plan (Crestwood Midstream LTIP) (formerly the Inergy Midstream, L.P. Long Term Incentive Plan) in order to align the economic interests of key employees and directors with those of CEQP and CMLP's common unitholders and to provide an incentive for continuous employment. Long-term incentive compensation consist solely of grants of restricted common units (which represent limited partner interests of CEQP and CMLP) which vest based upon continued service.
	On January 17, 2014, we issued restricted unit awards, which were approved by the CEQP and CMLP Boards' compensation committees, to certain key employees. The awards consisted of an annual award based on a percentage of each recipient's annual salary, and a one-time bridge award designed to provide an additional base award to certain key employees with no remaining unvested awards given that their previously accumulated equity ownership in Legacy Inergy and Legacy Crestwood vested as a result of the change of control with the Crestwood Merger. Both of these awards vest upon continued service.
	Crestwood LTIP
	The following table summarizes information regarding restricted unit activity during the three months ended March 31, 2014:
		Units		Weighted-Average Grant Date Fair Value
	Unvested - January 1, 2014	493,543		$	13.96
	Vested - restricted units	(129,218	)	$	13.96
	Granted - restricted units	1,292,758		$	13.29
	Unvested - March 31, 2014	1,657,083		$	13.44
	As of March 31, 2014 and December 31, 2013, we had total unamortized compensation expense of approximately $15.3 million and $1.6 million related to restricted units, which we expect will be amortized during the next three years (or sooner in certain cases, which generally represents the original vesting period of these instruments), except for grants to non-employee directors of our general partner, which vest over one year. We recognized compensation expense of approximately $2.5 million (including $1.7 million that was allocated to Crestwood Midstream) under the Crestwood LTIP during the three months ended March 31, 2014, which is included in general and administrative expenses on our consolidated statements of operations.  We granted restricted units with a grant date fair value of approximately $17.2 million during the three months ended March 31, 2014.  As of March 31, 2014, we had 8,134,677 units available for issuance under the Crestwood LTIP.
	Under the Crestwood LTIP, participants who have been granted restricted units may elect to have us withhold common units to satisfy minimum statutory tax withholding obligations arising in connection with the vesting of non-vested common units. Any such common units withheld are returned to the Crestwood LTIP on the applicable vesting dates, which correspond to the times at which income is recognized by the employee. When we withhold these common units, we are required to remit to the appropriate taxing authorities the fair value of the units withheld as of the vesting date. The number of units withheld is determined based on the closing price per common unit as reported on the NYSE on such dates. During the three months ended March 31, 2014 we withheld 47,800 common units to satisfy employee tax withholding obligations.
	Crestwood Midstream LTIP
	The following table summarizes information regarding restricted unit activity during the three months ended March 31, 2014:
		Units		Weighted-Average Grant Date Fair Value
	Unvested - January 1, 2014	250,557		$	22.13
	Vested - restricted units	(20,568	)	$	21.68
	Granted - restricted units	757,902		$	23.41
	Unvested - March 31, 2014	987,891		$	23.13
	As of March 31, 2014 and December 31, 2013, we had total unamortized compensation expense of approximately $16.4 million and $1.8 million related to restricted units issued under the Crestwood Midstream LTIP, which we expect will be amortized during the next three years (or sooner in certain cases, which generally represents the original vesting period of these instruments), except for grants to non-employee directors of our general partner, which vest over one year. Crestwood Midstream recognized compensation expense of approximately $2.9 million and $0.6 million during the three months ended March 31, 2014 and 2013, which is included in general and administrative expenses on our consolidated statements of operations. The compensation expense recognized during the three months ended March 31, 2013 was related to the Legacy Crestwood long-term incentive plan. We granted restricted units with a grant date fair value of approximately $17.7 million during the three months ended March 31, 2014.  As of March 31, 2014, we had 6,391,871 units available for issuance under the Crestwood Midstream LTIP.
	Under the Crestwood Midstream LTIP, participants who have been granted restricted units may elect to have us withhold common units to satisfy minimum statutory tax withholding obligations arising in connection with the vesting of non-vested common units. Any such common units withheld are returned to the Crestwood Midstream LTIP on the applicable vesting dates, which correspond to the times at which income is recognized by the employee. When we withhold these common units, we are required to remit to the appropriate taxing authorities the fair value of the units withheld as of the vesting date. The number of units withheld is determined based on the closing price per common unit as reported on the NYSE on such dates. During the three months ended March 31, 2014 and 2013, we withheld 7,456 common units and 1,529 common units to satisfy employee tax withholding obligations.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Legal Proceedings
	Class Action Lawsuits. Five putative class action lawsuits challenging the Crestwood Merger have been filed, four in federal court in the United States District Court for the Southern District of Texas: (i) Abraham Knoll v. Robert G. Phillips, et al. (Case No. 4:13-cv-01528); (ii) Greg Podell v. Crestwood Midstream Partners, LP, et al. (Case No. 4:13-cv-01599); (iii) Johnny Cooper v. Crestwood Midstream Partners LP, et al. (Case No. 4:13-cv-01660); and (iv) Steven Elliot LLC v. Robert G. Phillips, et al. (Case No. 4:13-cv-01763), and one in Delaware Chancery Court, Hawley v. Crestwood Midstream Partners LP, et al. (Case No. 8689-VCL).  All of the cases name Legacy Crestwood (since merged into the Company), Crestwood Gas Services GP LLC, Crestwood Holdings LLC, the current and former directors of Crestwood Gas Services GP LLC, the Company, Inergy Midstream, Crestwood Midstream GP LLC (formerly NRGM GP, LLC), and Intrepid Merger Sub, LLC as defendants.  All of the suits are brought by a purported holder of common units of Inergy Midstream, both individually and on behalf of a putative class consisting of holders of common units of Inergy Midstream.  The lawsuits generally allege, among other things, that the directors of Crestwood Gas Services GP LLC breached their fiduciary duties to holders of common units of Inergy Midstream by agreeing to a transaction with inadequate consideration and unfair terms and pursuant to an inadequate process.  The lawsuits further allege that the Company, Inergy Midstream, Crestwood Midstream GP LLC, and Intrepid Merger Sub, LLC aided and abetted the Legacy Crestwood directors in the alleged breach of their fiduciary duties.  The lawsuits seek, in general, (i) injunctive relief enjoining the merger, (ii) in the event the merger is consummated, rescission or an award of rescissory damages, (iii) an award of plaintiffs' costs, including reasonable attorneys' and experts' fees, (iv) the accounting by the defendants to plaintiffs for all damages caused by the defendants, and (v) such further equitable relief as the court deems just and proper.  Certain of the actions also assert claims of inadequate disclosure under Sections 14(a) and 20(a) of the Securities Exchange Act of 1934, and the Elliot case also names Citigroup Global Markets Inc. as an alleged aider and abettor.  The plaintiff in the Hawley action in Delaware filed a motion for expedited proceedings but subsequently withdrew that motion and then filed a stipulation voluntarily dismissing the action without prejudice (which has not yet been approved by the Court).  The plaintiffs in the Knoll, Podell, Cooper, and Elliot actions filed an unopposed motion to consolidate these four cases, which the Court granted and captioned the consolidated matter as In re Crestwood Midstream Partners Unitholder Litigation, Lead Case No. 4:13-cv-01528 (the “Consolidated Action”). The plaintiffs entered into a Memorandum of Understanding (MOU) on September 24, 2013 to settle the Consolidated Action whereby the defendants denied liability. The settlement contemplated by the MOU is subject to a number of conditions, including notice to the class and final court approval following completion of a settlement hearing, which is scheduled for May 16, 2014. The defendants expect the Court to approve the final settlement. The anticipated settlement of the MOU will not have a material impact to our consolidated financial statements.
	Declaratory Action. In January 2014, the entity from whom we lease our Tres Palacios caverns, Underground Services Markham, LLC (USM), filed a petition in the 269th Judicial District Court, Harris County, Texas (Case No. 2014-00823) requesting declaratory judgment on several issues, including whether or not Tres Palacios Gas Storage LLC (TPGS) has breached its lease obligations by filing an application with the FERC to reduce the certificated working gas storage capacity of our Tres Palacios natural gas storage facility. We filed our response to USM’s petition on January 31, 2014, and requested that the court dismiss the petition based on several grounds.
	On March 4, 2014, USM and TPGS filed a joint motion for abatement with the District Court requesting an abatement until the FERC renders a decision in TPGS’s abandonment proceeding. The District Court granted the parties’ motion on March 13, 2014 and, on March 26, 2014, USM withdrew its request that the FERC hold TPGS’s request for abandonment in abeyance pending the District Court’s ruling in the state court action. On April 15, 2014, TPGS filed with the FERC the results of a binding open season soliciting bids that closed on April 4, 2014, during which TPGS solicited offers for up to 22.9 Bcf of firm storage capacity at Tres Palacios. We continue to believe that TPGS is entitled under its lease to request FERC authorization to reduce Tres Palacios’ certificated working gas storage capacity, and that a reduction of such certificated working gas storage capacity will result in lower annual lease payments to USM under our lease.
	Arrow Acquisition Class Action Lawsuit. Prior to the completion of the Arrow Acquisition on November 8, 2013, a train transporting over 50,000 barrels of crude oil produced in North Dakota derailed in Lac Megantic, Quebec, Canada on July 6, 2013. The derailment resulted in the death of 47 people, injured numerous others, and caused severe damage to property and the environment.  In October 2013, certain individuals suffering harm in the derailment filed a motion to certify a class action lawsuit in the Superior Court for the District of Megantic, Province of Quebec, Canada, on behalf of all persons suffering loss in the derailment.
	In March 2014, the plaintiffs filed their fourth amended motion to name Arrow and numerous other energy companies as additional defendants in the class action lawsuit. The plaintiffs have named at least 53 defendants purportedly involved in the events leading up to the derailment, including the producers and sellers of the crude being transported, the midstream companies that transported the crude from the well head to the rail system, the manufacturers of the rail cars used to transport the crude, the railroad companies involved, the insurers of these companies, and the Canadian Attorney General.  The plaintiffs allege, among other things, that Arrow (i) was a producer of the crude oil being transported on the derailed train, (ii) was negligent in failing to properly classify the crude delivered to the trucks that hauled the crude to rail loading terminal, and (iii) owed a duty to the petitioners to ensure the safe transportation of the crude being transported.  The motion to authorize the class action will be heard in June 2014.  We believe the claims against us are without merit and will vigorously defend ourselves and oppose the motion for class action.  Moreover, to the extent this action proceeds, we believe we have meritorious defenses to the claims.  Because this litigation is in the early stages of the proceeding, we are unable to estimate a reasonably possible loss or range of loss in this matter.  We have also notified our insurance company of the claim.
	We are periodically involved in litigation proceedings. If we determine that a negative outcome is probable and the amount of loss is reasonably estimable, then we accrue the estimated amount. The results of litigation proceedings cannot be predicted with certainty. We could incur judgments, enter into settlements or revise our expectations regarding the outcome of certain matters, and such developments could have a material adverse effect on our results of operations or cash flows in the period in which the amounts are paid and/or accrued. As of March 31, 2014 and December 31, 2013, we had less than $0.1 million accrued for our outstanding legal matters. Based on currently available information, we believe it is remote that future costs related to known contingent liability exposures will exceed current accruals by an amount that would have a material adverse impact on our consolidated financial statements. As we learn new facts concerning contingencies, we reassess our position
	both with respect to accrued liabilities and other potential exposures.
	Any loss estimates are inherently subjective, based on currently available information, and are subject to management's judgment and various assumptions. Due to the inherently subjective nature of these estimates and the uncertainty and unpredictability surrounding the outcome of legal proceedings, actual results may differ materially from any amounts that have been accrued.
	Regulatory Compliance
	In the ordinary course of our business, we are subject to various laws and regulations. In the opinion of our management, compliance with current laws and regulations will not have a material effect on its results of operations, cash flows or financial condition.
	Environmental Compliance
	Our operations are subject to stringent and complex laws and regulations pertaining to health, safety, and the environment. We are subject to laws and regulations at the federal, state and local levels that relate to air and water quality, hazardous and solid waste management and disposal and other environmental matters. The cost of planning, designing, constructing and operating our facilities must incorporate compliance with environmental laws and regulations and safety standards. Failure to comply with these laws and regulations may trigger a variety of administrative, civil and potentially criminal enforcement measures. Our accruals and potential exposures related to our environmental matters were immaterial at March 31, 2014 and December 31, 2013.
	Contingent Consideration - Antero
	In connection with the Antero Acquisition, Legacy Crestwood agreed to pay Antero conditional consideration in the form of potential additional cash payments of up to $40 million, depending on the achievement of certain defined average annual production levels achieved during 2012, 2013 and 2014. During 2012 and 2013, Antero did not meet the annual production level to earn additional payments. Based on our estimates of Antero’s 2014 production, we believe their production levels will likely exceed the annual production threshold in the earn-out provision and accordingly, we recognized a liability of $33.5 million and $31.4 million as of March 31, 2014 and December 31, 2013 that represents the fair value of the potential payments that may be made under this earn-out provision. We estimated the liability based on the probability-weighted discounted cash flows using a 5.9% discount rate and our estimate of Antero’s production in 2014 (a Level 3 fair value measurement).

Related_Party_Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	Related Party Transactions
	The following table shows revenues, costs of goods sold and operations and maintenance expenses from our affiliates for the three-month periods ended March 31, 2014 and 2013 (in millions):
		Three Months Ended
		March 31,
		2014(a)		2013
	Gathering and processing revenues	$	0.9	$	25.6
	Gathering and processing costs of goods sold	$	11	$	6.8
	General and administrative expenses	$	3.8	$	5.8
	(a)	Concurrent with the Crestwood Merger, Quicksilver Resources Inc. (Quicksilver) is no longer a related party, and as a result our transactions with Quicksilver subsequent to June 19, 2013, are now considered non-affiliated transactions.
	The following table shows accounts receivable and accounts payable from our affiliates as of March 31, 2014 and December 31, 2013 (in millions):
		March 31, 2014		December 31, 2013
	Accounts receivable	$	0.5	$	—
	Accounts payable	$	6.6	$	3.6
	For additional information regarding our related parties, see our 2013 Annual Report on Form 10-K as filed with the SEC.

Segments

Segments	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Segments	'
	Segments
	Financial Information
	We have three operating and reporting segments: (i) gathering and processing operations; (ii) storage and transportation operations; and (iii) NGL and crude services operations. Our gathering and processing operations engage in the gathering, processing, treating, compression, transportation and sales of natural gas and the delivery of NGLs. Our storage and transportation operations provide regulated natural gas storage and transportation services to producers, utilities and other customers. Our NGL and crude services operations provide NGLs and crude oil gathering, storage, marketing, supply and logistics services to producers, refiners, marketers, and other customers that effectively provide flow assurances to our customers, as well as the production and sale of salt products. Our corporate operations include all general and administrative expenses that are not allocated to our reportable segments. We assess the performance of our operating segments based on EBITDA, which represents operating income plus depreciation, amortization and accretion expense.
	The following table is a reconciliation of net income to EBITDA (in millions):
		Three Months Ended
		March 31,
		2014			2013
	Net income	$	13.2		$	3.9
	Add:
	Interest and debt expense, net	31.7			11.4
	Provision for income taxes	0.8			0.4
	Depreciation, amortization and accretion	66.3			22.4
	EBITDA	$	112		$	38.1
	The following tables summarize the reportable segment data for the three months ended March 31, 2014 and 2013 (in millions). The net asset/liability from price risk management, as reported in the accompanying consolidated balance sheets, is primarily related to the NGL and crude services segment.
		Three Months Ended March 31, 2014
		Gathering and Processing			Storage and Transportation		NGL and Crude Services			Corporate			Total
	Operating revenues	$	79.5		$	51	$	841.1		$	—		$	971.6
	Costs of product/services sold	18.7			6.8		760.5			—			786
	Operations and maintenance expense	13.4			6.2		24.5			—			44.1
	General and administrative expense	—			—		—			27.9			27.9
	Gain on long-lived assets	0.5			—		—			—			0.5
	Loss on contingent consideration	(2.1		)	—		—			—			(2.1		)
	Earnings (loss) from unconsolidated affiliates, net	0.3			—		(0.4		)	—			(0.1		)
	Other income	—			—		—			0.1			0.1
	EBITDA	$	46.1		$	38	$	55.7		$	(27.8	)	$	112
	Goodwill	$	356.8		$	728.6	$	1,463.20		$	—		$	2,548.60
	Total assets	$	2,547.80		$	2,162.70	$	3,582.10		$	187.9		$	8,480.50
	Cash expenditures for property, plant and equipment	$	41.7		$	1.6	$	25.9		$	3.6		$	72.8
		Three Months Ended March 31, 2013
		Gathering and Processing			Storage and Transportation		NGL and Crude Services			Corporate			Total
	Operating revenues	$	72.4		$	—	$	—		$	—		$	72.4
	Costs of product/services sold	13.5			—		—			—			13.5
	Operations and maintenance expense	13			—		—			—			13
	General and administrative expense	—			—		—			7.8			7.8
	EBITDA	$	45.9		$	—	$	—		$	(7.8	)	$	38.1
	Goodwill	$	352.2		$	—	$	—		$	—		$	352.2
	Total assets	$	2,279.40		$	—	$	—		$	23.5		$	2,302.90
	Cash expenditures for property, plant and equipment	$	23.9		$	—	$	—		$	0.4		$	24.3
	Major Customers
	No customer accounted for 10% or more of our total consolidated revenues for the three months ended March 31, 2014. Two customers, Quicksilver and Antero Resources Appalachian Corporation (Antero), accounted for approximately 35% and 20% of our total consolidated revenues for the three months ended March 31, 2013, respectively. All Quicksilver and Antero revenues are captured in the gathering and processing segment.
	One customer, QEP Energy Company (QEP), accounted for approximately 11% of our consolidated accounts receivable at March 31, 2014. QEP's accounts receivable are captured in the NGL and crude services segment. One customer, Tesoro Refining & Marketing Company (Tesoro), accounted for approximately 10% of our consolidated accounts receivable at December 31, 2013. Tesoro's accounts receivable are captured in the NGL and crude services segment.

Condensed_Consolidating_Financ

Condensed Consolidating Financial Information	3 Months Ended
	Mar. 31, 2014
Text Block [Abstract]	'
Condensed Consolidating Financial Information	'
	Condensed Consolidating Financial Information
	We are a holding company and own no operating assets and have no significant operations independent of our subsidiaries. Obligations under our outstanding senior notes and credit agreement are jointly and severally guaranteed by our wholly owned domestic subsidiaries. Legacy Crestwood GP and Crestwood Midstream and its wholly owned subsidiaries (Non-Guarantor Subsidiaries) do not guarantee our senior notes or credit facility. CEQP Finance Corp., the co-issuer of our senior notes, is our 100% owned subsidiary and has no material assets, operations, revenues or cash flows other than those related to its service as co-issuer of our senior notes.
	As discussed in Note 1, the accounting for the reverse acquisition of Legacy Inergy results in Legacy Inergy's historical operations being acquired on June 19, 2013. Our senior notes are thus not included in the financial statements prior to June 19, 2013. Since Legacy Crestwood GP (the accounting predecessor) does not guarantee any debt, the condensed consolidated financial statements do not include financial information for the three months ended March 31, 2013.
	The tables below present condensed consolidating financial statements for us (parent) on a stand-alone, unconsolidated basis, and our combined guarantor and combined non-guarantor subsidiaries as of March 31, 2014 and December 31, 2013, and for the three months ended March 31, 2014. The financial information may not necessarily be indicative of the results of operations, cash flows or financial position had the subsidiaries operated as independent entities.
	Condensed Consolidating Balance Sheet
	31-Mar-14
	(in millions)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiaries			Guarantor
								Subsidiaries
	Assets
	Current assets:
	Cash and cash equivalents	$	0.1		$	2.6		$	5		$	—		$	7.7
	Accounts receivable	—			160.8			237.3			(33.8		)	364.3
	Inventories	—			29.1			10.7			—			39.8
	Other current assets	—			25.9			13.6			—			39.5
	Total current assets	0.1			218.4			266.6			(33.8		)	451.3
	Property, plant and equipment, net	—			401.7			3,536.70			—			3,938.40
	Goodwill and intangible assets, net	—			726.9			3,160.00			—			3,886.90
	Investment in subsidiaries	5,851.20			—			—			(5,851.2		)	—
	Other assets	—			9.5			194.4			—			203.9
	Total assets	$	5,851.30		$	1,356.50		$	7,157.70		$	(5,885.0	)	$	8,480.50
	Liabilities and partners' capital
	Current liabilities:
	Accounts payable	$	—		$	160		$	191.2		$	(33.8	)	$	317.4
	Other current liabilities	8.2			33.1			162.2			—			203.5
	Total current liabilities	8.2			193.1			353.4			(33.8		)	520.9
	Long-term liabilities:
	Long-term debt, less current portion	398.2			—			1,979.10			—			2,377.30
	Other long-term liabilities	16.6			109.4			28			—			154
	Total long-term liabilities	414.8			109.4			2,007.10			—			2,531.30
	Partners' capital	815.1			1,054.00			184			(1,238.0		)	815.1
	Interest of non-controlling partners in subsidiaries	4,613.20			—			4,613.20			(4,613.2		)	4,613.20
	Total partners' capital	5,428.30			1,054.00			4,797.20			(5,851.2		)	5,428.30
	Total liabilities and partners' capital	$	5,851.30		$	1,356.50		$	7,157.70		$	(5,885.0	)	$	8,480.50
	Condensed Consolidating Balance Sheet
	31-Dec-13
	(in millions)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiaries			Guarantor
								Subsidiaries
	Assets
	Current assets:
	Cash and cash equivalents	$	0.1		$	2.4		$	2.7		$	—		$	5.2
	Accounts receivable	—			207.5			205.1			—			412.6
	Inventories	—			66.6			7			—			73.6
	Other current assets	—			25.8			10.2			(5.4		)	30.6
	Total current assets	0.1			302.3			225			(5.4		)	522
	Property, plant and equipment, net	—			400.9			3,504.40			—			3,905.30
	Goodwill and intangible assets, net	—			742.4			3,170.20			—			3,912.60
	Investment in subsidiary	5,927.10			—			—			(5,927.1		)	—
	Other assets	—			10.2			173.1			—			183.3
	Total assets	$	5,927.20		$	1,455.80		$	7,072.70		$	(5,932.5	)	$	8,523.20
	Liabilities and partners' capital
	Current liabilities:
	Accounts payable	$	—		$	218.3		$	160.7		$	—		$	379
	Other current liabilities	4.2			61.6			156.7			(5.4		)	217.1
	Total current liabilities	4.2			279.9			317.4			(5.4		)	596.1
	Long-term liabilities:
	Long-term debt, less current portion	393			—			1,867.90			—			2,260.90
	Other long-term liabilities	21.4			109.9			26.3			—			157.6
	Total long-term liabilities	414.4			109.9			1,894.20			—			2,418.50
	Partners' capital	831.6			1,066.00			184.1			(1,250.1		)	831.6
Interest of non-controlling partners in subsidiaries	4,677.00			—			4,677.00			(4,677.0		)	4,677.00
Total partners' capital	5,508.60			1,066.00			4,861.10			(5,927.1		)	5,508.60
Total liabilities and partners' capital	$	5,927.20		$	1,455.80		$	7,072.70		$	(5,932.5	)	$	8,523.20
Condensed Consolidating Statements of Operations
Three Months Ended March 31, 2014
(in millions)
	Parent			Guarantor			Non-			Eliminations			Consolidated
				Subsidiaries			Guarantor
							Subsidiaries
Revenues:
Gathering and processing	$	—		$	—		$	78.6		$	—		$	78.6
Storage and transportation	—			6.7			44.3			—			51
NGL and crude services	—			431.2			409.9			—			841.1
Related party	—			—			4.2			(3.3		)	0.9
	—			437.9			537			(3.3		)	971.6
Costs of product/services sold (excluding depreciation, amortization and accretion as shown below):
Gathering and processing	—			—			7.7			—			7.7
Storage and transportation	—			3.6			3.2			—			6.8
NGL and crude services	—			384.3			376.2			—			760.5
Related party	—			3.3			11			(3.3		)	11
	—			391.2			398.1			(3.3		)	786
Expenses:
Operations and maintenance	—			16.1			28			—			44.1
General and administrative	—			3.8			24.1			—			27.9
Depreciation, amortization and accretion	—			10.7			55.6			—			66.3
Other	—			—			1.6			—			1.6
Operating income	—			16.1			29.6			—			45.7
Other income (expense):
Interest and debt expense, net	(3.6		)	—			(28.1		)	—			(31.7		)
Other	—			0.1			(0.1		)	—			—
Equity in net income of subsidiary	16.8			—			—			(16.8		)	—
Income (loss) before income taxes	13.2			16.2			1.4			(16.8		)	14
Provision for income taxes	—			0.1			0.7			—			0.8
Net income (loss)	13.2			16.1			0.7			(16.8		)	13.2
Net loss attributable to non-controlling partners in subsidiaries	—			—			6.4			—			6.4
Net income (loss) attributable to partners	$	13.2		$	16.1		$	7.1		$	(16.8	)	$	19.6
Condensed Consolidating Statements of Comprehensive Income
Three Months Ended March 31, 2014
(in millions)
	Parent			Guarantor			Non-			Eliminations			Consolidated
				Subsidiaries			Guarantor
							Subsidiaries
Net income (loss)	$	13.2		$	16.1		$	0.7		$	(16.8	)	$	13.2
Change in Suburban Propane Partners LP units	(0.8		)	—			—			—			(0.8		)
Comprehensive income (loss)	$	12.4		$	16.1		$	0.7		$	(16.8	)	$	12.4
Condensed Consolidating Statements of Cash Flows
Three Months Ended March 31, 2014
(in millions)
	Parent			Guarantor			Non-			Eliminations			Consolidated
				Subsidiaries			Guarantor
							Subsidiaries
Cash flows from operating activities	$	—		$	14.2		$	58.1		$	—		$	72.3
Cash flows from investing activities
Acquisitions, net of cash acquired	—			—			(12.1		)	—			(12.1		)
Purchases of property, plant and equipment	—			(5.1		)	(67.7		)	—			(72.8		)
Investment in unconsolidated affiliates, net	—			—			(19.8		)	—			(19.8		)
Distributions received and other	36.1			10.5			—			(46.6		)	—
Net cash provided by (used in) investing activities	36.1			5.4			(99.6		)	(46.6		)	(104.7		)
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	—			190.4			306			—			496.4
Principal payments on long-term debt	—			(183.8		)	(188.8		)	—			(372.6		)
Distributions paid	(36.1		)	(25.6		)	(10.5		)	46.6			(25.6		)
Distributions paid to non-controlling partners	—			—			(74.1		)	—			(74.1		)
Proceeds from issuance of preferred equity	—			—			12.3			—			12.3
Other	—			(0.4		)	(1.1		)	—			(1.5		)
Net cash provided by (used in) financing activities	(36.1		)	(19.4		)	43.8			46.6			34.9
Net increase in cash	—			0.2			2.3			—			2.5
Cash at beginning of period	0.1			2.4			2.7			—			5.2
Cash at end of period	$	0.1		$	2.6		$	5		$	—		$	7.7

Certain_Balance_Sheet_Informat1

Certain Balance Sheet Information (Tables)	3 Months Ended
	Mar. 31, 2014
Balance Sheet Related Disclosures [Abstract]	'
Property, Plant And Equipment	'
	Property, plant and equipment consisted of the following at March 31, 2014 and December 31, 2013 (in millions):
		March 31,		December 31,
		2014		2013
	Gathering systems and pipelines	$	1,473.10	$	1,473.40
	Facilities and equipment	1,435.50		1,186.50
	Buildings, land, rights-of-way, storage contracts and easements	818.4		814.7
	Vehicles	40.4		35.8
	Construction in process	183.2		365.8
	Base gas	102		102
	Salt deposits	120.5		120.5
	Office furniture and fixtures	10.6		10
		4,183.70		4,108.70
	Less: accumulated depreciation and depletion	245.3		203.4
	Total property, plant and equipment, net	$	3,938.40	$	3,905.30
Intangible Assets	'
	Intangible assets consisted of the following at March 31, 2014 and December 31, 2013 (in millions):
		March 31,		December 31,
		2014		2013
	Customer accounts	$	580.8	$	576.9
	Covenants not to compete	7.9		7
	Gas gathering, compression and processing contracts	750.2		750.2
	Acquired storage contracts	43.5		43.5
	Trademarks	33.5		33.5
	Deferred financing and other costs	55.3		55.3
		1,471.20		1,466.40
	Less: accumulated amortization	132.9		106
	Total intangible assets, net	$	1,338.30	$	1,360.40
Schedule of Accrued Liabilities	'
	Accrued expenses and other liabilities consisted of the following at March 31, 2014 and December 31, 2013 (in millions):
		March 31, 2014		December 31, 2013
	Accrued expenses	$	42.1	$	40.3
	Accrued property taxes	4.8		9.4
	Accrued product purchases payable	1.9		1.6
	Tax payable	11.9		14.8
	Interest payable	28.8		16.7
	Accrued additions to property, plant and equipment	55.5		58.2
	Commitments and contingent liabilities (Note 12)	33.5		31.4
	Capital leases	2.2		2.6
	Deferred revenue	2.8		2.1
	Total accrued expenses and other liabilities	$	183.5	$	177.1

Acquisitions_Tables

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	The following table summarizes the preliminary fair values of the assets acquired and liabilities assumed at the acquisition date (in millions):
	Current assets	$	191.1
	Property, plant and equipment	400.2
	Intangible assets	323.4
	Other assets	19.5
	Total identifiable assets acquired	934.2
	Current liabilities	215.3
	Assets retirement obligations	1.2
	Other long-term liabilities	3.7
	Total liabilities assumed	220.2
	Net identifiable assets acquired	714
	Goodwill	48.8
	Net assets acquired	$	762.8
	The following table summarizes the preliminary fair values of the assets acquired and liabilities assumed at the merger date (in millions):
		Current Estimate		Preliminary Estimate (a)		Adjustment Based on Revised Valuation Report
	Current assets	$	224.5	$	224.5	$	—
	Property, plant and equipment	2,088.10		2,088.20		(0.1		)
	Intangible assets	337.5		337.5		—
	Other assets	12.7		12.7		—
	Total identifiable assets acquired	2,662.80		2,662.90		(0.1		)
	Current liabilities	207.6		207.5		0.1
	Long-term debt	1,079.30		1,079.30		—
	Other long-term liabilities	146.6		146.6		—
	Total liabilities assumed	1,433.50		1,433.40		0.1
	Net identifiable assets acquired	1,229.30		1,229.50		(0.2		)
	Goodwill	2,139.80		2,149.90		(10.1		)
	Net assets acquired	$	3,369.10	$	3,379.40	$	(10.3	)
	(a)    Preliminary amount recorded as of December 31, 2013.
Business Acquisition, Pro Forma Information	'
	The following table represents the pro forma consolidated statement of operations as if the Legacy Inergy reverse acquisition and the Arrow Acquisition had been included in our consolidated results for the three-month period ended March 31, 2013 (in millions, except per unit information):
	Revenues	$	811.3
	Net income	$	6.9
	Net income per limited partner unit(a):
	Basic	$	0.06
	Diluted	$	0.06
	(a) Basic and diluted net income per limited partner unit for the three months ended March 31, 2013 were computed based on the presumption that the common and subordinated units issued to acquire Legacy Crestwood GP (the accounting predecessor) were outstanding for the entire period prior to the June 19, 2013 acquisition.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	'
	We estimate the fair value of our senior notes primarily based on quoted market prices for the same or similar issuances (representing a Level 2 fair value measurement). The following table reflects the carrying value and fair value of the senior notes (in millions):
		March 31, 2014				December 31, 2013
		Carrying Amount		Fair		Carrying Amount		Fair
				Value				Value
	CEQP Senior Notes	$	11.4	$	11.6	$	11.4	$	11.6
	Crestwood Midstream 2022 Senior Notes	$	600	$	624	$	600	$	617.3
	Crestwood Midstream 2019 Senior Notes	$	351.2	$	381.5	$	351.2	$	379.3
	Crestwood Midstream 2020 Senior Notes	$	504.5	$	528.4	$	504.7	$	513.8
Assets And Liabilities Measured At Fair Value On Recurring Basis	'
	The following tables set forth by level within the fair value hierarchy, our assets and liabilities that were accounted for at fair value on a recurring basis at March 31, 2014 and December 31, 2013 (in millions):
		31-Mar-14
		Fair Value of Derivatives
		Level 1		Level 2		Level 3		Total		Netting			Total
										Agreements(a)
	Assets
	Assets from price risk management	$	0.1	$	10.2	$	—	$	10.3	$	(0.2	)	$	10.1
	SPH units	5.9		—		—		5.9		—			5.9
	Total assets at fair value	$	6	$	10.2	$	—	$	16.2	$	(0.2	)	$	16
	Liabilities
	Liabilities from price risk management	$	0.1	$	8.8	$	—	$	8.9	$	(2.9	)	$	6
	Interest rate swaps	—		3.7		—		3.7		—			3.7
	Total liabilities at fair value	$	0.1	$	12.5	$	—	$	12.6	$	(2.9	)	$	9.7
		31-Dec-13
		Fair Value of Derivatives
		Level 1		Level 2		Level 3		Total		Netting			Total
										Agreements(a)
	Assets
	Assets from price risk management	$	0.3	$	27.7	$	—	$	28	$	(13.5	)	$	14.5
	SPH units	6.7		—		—		6.7		—			6.7
	Total assets at fair value	$	7	$	27.7	$	—	$	34.7	$	(13.5	)	$	21.2
	Liabilities
	Liabilities from price risk management	$	0.1	$	39.5	$	—	$	39.6	$	(4.7	)	$	34.9
	Interest rate swaps	—		4.3		—		4.3		—			4.3
	Total liabilities at fair value	$	0.1	$	43.8	$	—	$	43.9	$	(4.7	)	$	39.2
	(a)	Amounts represent the impact of legally enforceable master netting agreements that allow us to settle positive and negative positions as well as cash collateral held or placed with the same counterparties.

Risk_Management_Tables

Risk Management (Tables)	3 Months Ended
	Mar. 31, 2014
Risk Management - Notional Amounts and Terms of Companys Derivative Financial Instruments [Abstract]	'
Notional Amounts And Terms Of Company's Derivative Financial Instruments	'
	The notional amounts and terms of our derivative financial instruments include the following at March 31, 2014 and December 31, 2013, respectively (in millions):
		31-Mar-14		31-Dec-13
		Fixed Price	Fixed Price	Fixed Price	Fixed Price
		Payor	Receiver	Payor	Receiver
	Propane, crude and heating oil (barrels)	4.4	4.5	5.6	6.8
	Natural gas (MMBTU’s)	0.1	0.1	—	—

LongTerm_Debt_Tables

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2014
Text Block [Abstract]	'
Components Of Long-Term Debt	'
	Long-term debt consisted of the following at March 31, 2014 and December 31, 2013 (in millions):
		March 31,		December 31,
		2014		2013
	CEQP Credit Facility	$	387.6	$	381
	CEQP Senior Notes	11.4		11.4
	Crestwood Midstream Revolver	532.1		414.9
	Crestwood Midstream 2019 Senior Notes	350		350
	Premium on Crestwood Midstream 2019 Senior Notes	1.2		1.2
	Crestwood Midstream 2020 Senior Notes	500		500
	Fair value adjustment of Crestwood Midstream 2020 Senior Notes	4.5		4.7
	Crestwood Midstream 2022 Senior Notes	600		600
	Other	4.5		2.8
	Total debt	2,391.30		2,266.00
	Less: current portion	14		5.1
	Total long-term debt	$	2,377.30	$	2,260.90

Partners_Capital_Partners_Capi

Partners' Capital Partners' Capital (Tables)	3 Months Ended
	Mar. 31, 2014
Statement of Partners' Capital [Abstract]	'
Schedule of Distributions Made to Members or Limited Partners, by Distribution	'
	A summary of our limited partner quarterly distributions for the three months ended March 31, 2014 is presented below:
	Three Months Ended March 31, 2014
	Record Date	Payment Date	Per Unit Rate		Cash Distributions
					(in millions)
	February 7, 2014	February 14, 2014	$	0.1375	$	25.6

LongTerm_Incentive_Plans_Table

Long-Term Incentive Plans (Tables)	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]	'
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award	'
	The following table summarizes information regarding restricted unit activity during the three months ended March 31, 2014:
		Units		Weighted-Average Grant Date Fair Value
	Unvested - January 1, 2014	250,557		$	22.13
	Vested - restricted units	(20,568	)	$	21.68
	Granted - restricted units	757,902		$	23.41
	Unvested - March 31, 2014	987,891		$	23.13
	The following table summarizes information regarding restricted unit activity during the three months ended March 31, 2014:
		Units		Weighted-Average Grant Date Fair Value
	Unvested - January 1, 2014	493,543		$	13.96
	Vested - restricted units	(129,218	)	$	13.96
	Granted - restricted units	1,292,758		$	13.29
	Unvested - March 31, 2014	1,657,083		$	13.44

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	3 Months Ended
	Mar. 31, 2014
Related Party Transactions [Abstract]	'
Schedule of Related Party Transactions	'
	The following table shows revenues, costs of goods sold and operations and maintenance expenses from our affiliates for the three-month periods ended March 31, 2014 and 2013 (in millions):
		Three Months Ended
		March 31,
		2014(a)		2013
	Gathering and processing revenues	$	0.9	$	25.6
	Gathering and processing costs of goods sold	$	11	$	6.8
	General and administrative expenses	$	3.8	$	5.8
	(a)	Concurrent with the Crestwood Merger, Quicksilver Resources Inc. (Quicksilver) is no longer a related party, and as a result our transactions with Quicksilver subsequent to June 19, 2013, are now considered non-affiliated transactions.
Schedule of Related Party Receivables and Payables	'
	The following table shows accounts receivable and accounts payable from our affiliates as of March 31, 2014 and December 31, 2013 (in millions):
		March 31, 2014		December 31, 2013
	Accounts receivable	$	0.5	$	—
	Accounts payable	$	6.6	$	3.6

Segments_Tables

Segments (Tables)	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]	'
Reconciliation of Net Income (Loss) to Earnings Before Interest, Taxes, Depreciation and Amortization	'
	The following table is a reconciliation of net income to EBITDA (in millions):
		Three Months Ended
		March 31,
		2014			2013
	Net income	$	13.2		$	3.9
	Add:
	Interest and debt expense, net	31.7			11.4
	Provision for income taxes	0.8			0.4
	Depreciation, amortization and accretion	66.3			22.4
	EBITDA	$	112		$	38.1
Summary Of Segment Information	'
	The following tables summarize the reportable segment data for the three months ended March 31, 2014 and 2013 (in millions). The net asset/liability from price risk management, as reported in the accompanying consolidated balance sheets, is primarily related to the NGL and crude services segment.
		Three Months Ended March 31, 2014
		Gathering and Processing			Storage and Transportation		NGL and Crude Services			Corporate			Total
	Operating revenues	$	79.5		$	51	$	841.1		$	—		$	971.6
	Costs of product/services sold	18.7			6.8		760.5			—			786
	Operations and maintenance expense	13.4			6.2		24.5			—			44.1
	General and administrative expense	—			—		—			27.9			27.9
	Gain on long-lived assets	0.5			—		—			—			0.5
	Loss on contingent consideration	(2.1		)	—		—			—			(2.1		)
	Earnings (loss) from unconsolidated affiliates, net	0.3			—		(0.4		)	—			(0.1		)
	Other income	—			—		—			0.1			0.1
	EBITDA	$	46.1		$	38	$	55.7		$	(27.8	)	$	112
	Goodwill	$	356.8		$	728.6	$	1,463.20		$	—		$	2,548.60
	Total assets	$	2,547.80		$	2,162.70	$	3,582.10		$	187.9		$	8,480.50
	Cash expenditures for property, plant and equipment	$	41.7		$	1.6	$	25.9		$	3.6		$	72.8
		Three Months Ended March 31, 2013
		Gathering and Processing			Storage and Transportation		NGL and Crude Services			Corporate			Total
	Operating revenues	$	72.4		$	—	$	—		$	—		$	72.4
	Costs of product/services sold	13.5			—		—			—			13.5
	Operations and maintenance expense	13			—		—			—			13
	General and administrative expense	—			—		—			7.8			7.8
	EBITDA	$	45.9		$	—	$	—		$	(7.8	)	$	38.1
	Goodwill	$	352.2		$	—	$	—		$	—		$	352.2
	Total assets	$	2,279.40		$	—	$	—		$	23.5		$	2,302.90
	Cash expenditures for property, plant and equipment	$	23.9		$	—	$	—		$	0.4		$	24.3

Condensed_Consolidating_Financ1

Condensed Consolidating Financial Information (Tables)	3 Months Ended
	Mar. 31, 2014
Text Block [Abstract]	'
Condensed Consolidating Balance Sheet	'
	Condensed Consolidating Balance Sheet
	31-Mar-14
	(in millions)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiaries			Guarantor
								Subsidiaries
	Assets
	Current assets:
	Cash and cash equivalents	$	0.1		$	2.6		$	5		$	—		$	7.7
	Accounts receivable	—			160.8			237.3			(33.8		)	364.3
	Inventories	—			29.1			10.7			—			39.8
	Other current assets	—			25.9			13.6			—			39.5
	Total current assets	0.1			218.4			266.6			(33.8		)	451.3
	Property, plant and equipment, net	—			401.7			3,536.70			—			3,938.40
	Goodwill and intangible assets, net	—			726.9			3,160.00			—			3,886.90
	Investment in subsidiaries	5,851.20			—			—			(5,851.2		)	—
	Other assets	—			9.5			194.4			—			203.9
	Total assets	$	5,851.30		$	1,356.50		$	7,157.70		$	(5,885.0	)	$	8,480.50
	Liabilities and partners' capital
	Current liabilities:
	Accounts payable	$	—		$	160		$	191.2		$	(33.8	)	$	317.4
	Other current liabilities	8.2			33.1			162.2			—			203.5
	Total current liabilities	8.2			193.1			353.4			(33.8		)	520.9
	Long-term liabilities:
	Long-term debt, less current portion	398.2			—			1,979.10			—			2,377.30
	Other long-term liabilities	16.6			109.4			28			—			154
	Total long-term liabilities	414.8			109.4			2,007.10			—			2,531.30
	Partners' capital	815.1			1,054.00			184			(1,238.0		)	815.1
	Interest of non-controlling partners in subsidiaries	4,613.20			—			4,613.20			(4,613.2		)	4,613.20
	Total partners' capital	5,428.30			1,054.00			4,797.20			(5,851.2		)	5,428.30
	Total liabilities and partners' capital	$	5,851.30		$	1,356.50		$	7,157.70		$	(5,885.0	)	$	8,480.50
	Condensed Consolidating Balance Sheet
	31-Dec-13
	(in millions)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiaries			Guarantor
								Subsidiaries
	Assets
	Current assets:
	Cash and cash equivalents	$	0.1		$	2.4		$	2.7		$	—		$	5.2
	Accounts receivable	—			207.5			205.1			—			412.6
	Inventories	—			66.6			7			—			73.6
	Other current assets	—			25.8			10.2			(5.4		)	30.6
	Total current assets	0.1			302.3			225			(5.4		)	522
	Property, plant and equipment, net	—			400.9			3,504.40			—			3,905.30
	Goodwill and intangible assets, net	—			742.4			3,170.20			—			3,912.60
	Investment in subsidiary	5,927.10			—			—			(5,927.1		)	—
	Other assets	—			10.2			173.1			—			183.3
	Total assets	$	5,927.20		$	1,455.80		$	7,072.70		$	(5,932.5	)	$	8,523.20
	Liabilities and partners' capital
	Current liabilities:
	Accounts payable	$	—		$	218.3		$	160.7		$	—		$	379
	Other current liabilities	4.2			61.6			156.7			(5.4		)	217.1
	Total current liabilities	4.2			279.9			317.4			(5.4		)	596.1
	Long-term liabilities:
	Long-term debt, less current portion	393			—			1,867.90			—			2,260.90
	Other long-term liabilities	21.4			109.9			26.3			—			157.6
	Total long-term liabilities	414.4			109.9			1,894.20			—			2,418.50
	Partners' capital	831.6			1,066.00			184.1			(1,250.1		)	831.6
	Interest of non-controlling partners in subsidiaries	4,677.00			—			4,677.00			(4,677.0		)	4,677.00
	Total partners' capital	5,508.60			1,066.00			4,861.10			(5,927.1		)	5,508.60
	Total liabilities and partners' capital	$	5,927.20		$	1,455.80		$	7,072.70		$	(5,932.5	)	$	8,523.20
Condensed Consolidating Statements of Operations	'
	Condensed Consolidating Statements of Operations
	Three Months Ended March 31, 2014
	(in millions)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiaries			Guarantor
								Subsidiaries
	Revenues:
	Gathering and processing	$	—		$	—		$	78.6		$	—		$	78.6
	Storage and transportation	—			6.7			44.3			—			51
	NGL and crude services	—			431.2			409.9			—			841.1
	Related party	—			—			4.2			(3.3		)	0.9
		—			437.9			537			(3.3		)	971.6
	Costs of product/services sold (excluding depreciation, amortization and accretion as shown below):
	Gathering and processing	—			—			7.7			—			7.7
	Storage and transportation	—			3.6			3.2			—			6.8
	NGL and crude services	—			384.3			376.2			—			760.5
	Related party	—			3.3			11			(3.3		)	11
		—			391.2			398.1			(3.3		)	786
	Expenses:
	Operations and maintenance	—			16.1			28			—			44.1
	General and administrative	—			3.8			24.1			—			27.9
	Depreciation, amortization and accretion	—			10.7			55.6			—			66.3
	Other	—			—			1.6			—			1.6
	Operating income	—			16.1			29.6			—			45.7
	Other income (expense):
	Interest and debt expense, net	(3.6		)	—			(28.1		)	—			(31.7		)
	Other	—			0.1			(0.1		)	—			—
	Equity in net income of subsidiary	16.8			—			—			(16.8		)	—
	Income (loss) before income taxes	13.2			16.2			1.4			(16.8		)	14
	Provision for income taxes	—			0.1			0.7			—			0.8
	Net income (loss)	13.2			16.1			0.7			(16.8		)	13.2
	Net loss attributable to non-controlling partners in subsidiaries	—			—			6.4			—			6.4
	Net income (loss) attributable to partners	$	13.2		$	16.1		$	7.1		$	(16.8	)	$	19.6
Condensed Consolidating Statements of Comprehensive Income	'
	Condensed Consolidating Statements of Comprehensive Income
	Three Months Ended March 31, 2014
	(in millions)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiaries			Guarantor
								Subsidiaries
	Net income (loss)	$	13.2		$	16.1		$	0.7		$	(16.8	)	$	13.2
	Change in Suburban Propane Partners LP units	(0.8		)	—			—			—			(0.8		)
	Comprehensive income (loss)	$	12.4		$	16.1		$	0.7		$	(16.8	)	$	12.4
Condensed Consolidating Statements of Cash Flows	'
	Condensed Consolidating Statements of Cash Flows
	Three Months Ended March 31, 2014
	(in millions)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiaries			Guarantor
								Subsidiaries
	Cash flows from operating activities	$	—		$	14.2		$	58.1		$	—		$	72.3
	Cash flows from investing activities
	Acquisitions, net of cash acquired	—			—			(12.1		)	—			(12.1		)
	Purchases of property, plant and equipment	—			(5.1		)	(67.7		)	—			(72.8		)
	Investment in unconsolidated affiliates, net	—			—			(19.8		)	—			(19.8		)
	Distributions received and other	36.1			10.5			—			(46.6		)	—
	Net cash provided by (used in) investing activities	36.1			5.4			(99.6		)	(46.6		)	(104.7		)
	Cash flows from financing activities:
	Proceeds from the issuance of long-term debt	—			190.4			306			—			496.4
	Principal payments on long-term debt	—			(183.8		)	(188.8		)	—			(372.6		)
	Distributions paid	(36.1		)	(25.6		)	(10.5		)	46.6			(25.6		)
	Distributions paid to non-controlling partners	—			—			(74.1		)	—			(74.1		)
	Proceeds from issuance of preferred equity	—			—			12.3			—			12.3
	Other	—			(0.4		)	(1.1		)	—			(1.5		)
	Net cash provided by (used in) financing activities	(36.1		)	(19.4		)	43.8			46.6			34.9
	Net increase in cash	—			0.2			2.3			—			2.5
	Cash at beginning of period	0.1			2.4			2.7			—			5.2
	Cash at end of period	$	0.1		$	2.6		$	5		$	—		$	7.7

Business_Description_Narrative

Business Description (Narrative) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014
	segment
Business Description [Line Items]	'
Number of Reportable Segments	3,000,000
Number of Operating Segments	3
First Reserve Management, L.P. [Member]	'
Business Description [Line Items]	'
General partner ownership percentage	27.00%
Crestwood Equity Partners LP	'
Business Description [Line Items]	'
General partner ownership percentage	4.00%
Incentive Distribution Rights, Distribution Percentage	100.00%
CMLP	'
Business Description [Line Items]	'
Incentive Distribution, Distribution Per Unit	0.37
Incentive Distribution Rights, Percent	50.00%
Subordinated Unit [Member]	'
Business Description [Line Items]	'
Units of Partnership Interest, Amount	4,387,889

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
	segment
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Deferred Revenue, Current	$2.80	'	$2.10
Inventory	39.8	'	73.6
Unit-based compensation expense	$5.40	$0.60	'
Number of Operating Segments	3	'	'

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Credit Risk and Concentrations) (Details) (Revenue, Customer Concentration Risk)	3 Months Ended
	Mar. 31, 2013
Quicksilver	'
Concentration Risk [Line Items]	'
Concentration Risk, Percentage	35.00%
Antero	'
Concentration Risk [Line Items]	'
Concentration Risk, Percentage	20.00%

Certain_Balance_Sheet_Informat2

Certain Balance Sheet Information (Inventories) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Inventory [Line Items]	'	'
Inventory	$39.80	$73.60

Certain_Balance_Sheet_Informat3

Certain Balance Sheet Information (Property, Plant And Equipment) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Total assets	$4,183.70	$4,108.70
Less: accumulated depreciation and depletion	245.3	203.4
Property, plant and equipment, net	3,938.40	3,905.30
Capital Leased Assets, Gross	6.3	5
Gathering systems and pipelines	'	'
Property, Plant and Equipment [Line Items]	'	'
Total assets	1,473.10	1,473.40
Facilities and Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total assets	1,435.50	1,186.50
Buildings, land, rights-of-way, storage contracts and easements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total assets	818.4	814.7
Vehicles	'	'
Property, Plant and Equipment [Line Items]	'	'
Total assets	40.4	35.8
Construction in process	'	'
Property, Plant and Equipment [Line Items]	'	'
Total assets	183.2	365.8
Base gas	'	'
Property, Plant and Equipment [Line Items]	'	'
Total assets	102	102
Salt deposits	'	'
Property, Plant and Equipment [Line Items]	'	'
Total assets	120.5	120.5
Office furniture and fixtures	'	'
Property, Plant and Equipment [Line Items]	'	'
Total assets	$10.60	$10

Certain_Balance_Sheet_Informat4

Certain Balance Sheet Information (Intangible Assets) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets, Gross	$1,471.20	$1,466.40
Less: accumulated amortization	132.9	106
Total intangible assets, net	1,338.30	1,360.40
Customer accounts	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets, Gross	580.8	576.9
Covenants not to compete	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets, Gross	7.9	7
Gas gathering, compression and processing contracts	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets, Gross	750.2	750.2
Acquired storage contracts	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets, Gross	43.5	43.5
Trademarks	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets, Gross	33.5	33.5
Deferred financing and other costs	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets, Gross	$55.30	$55.30

Certain_Balance_Sheet_Informat5

Certain Balance Sheet Information (Accrued Expenses and Other Liabilities) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Balance Sheet Related Disclosures [Abstract]	'	'
Other Accrued Liabilities, Current	$42.10	$40.30
Accrued expenses and other liabilities	183.5	177.1
Accrual for Taxes Other than Income Taxes, Current	4.8	9.4
Accrued Product Purchases Payable	1.9	1.6
Taxes Payable, Current	11.9	14.8
Interest Payable	28.8	16.7
Accrued Capital Purchases	55.5	58.2
Accrued Commitments and Contingent Liabilities	33.5	31.4
Accrued Capital Leases	2.2	2.6
Deferred Revenue, Current	$2.80	$2.10

Acquisitions_Narrative_Details

Acquisitions (Narrative) (Details) (USD $)

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Jan. 08, 2013

Mar. 21, 2014

Oct. 08, 2013

Mar. 31, 2014

Jun. 30, 2013

Oct. 31, 2013

Mar. 31, 2014

Nov. 08, 2013

Oct. 08, 2013

Jun. 19, 2013

Mar. 31, 2013

Mar. 31, 2014

Jun. 19, 2013

Mar. 31, 2013

In Millions, except Share data, unless otherwise specified

Red Rock Transportation, Inc. [Member]

Red Rock Transportation, Inc. [Member]

Inergy Midstream

Inergy Midstream

Arrow Midstream Holdings, LLC

Arrow Midstream Holdings, LLC

Arrow Midstream Holdings, LLC

Arrow Midstream Holdings, LLC

Storage and Transportation

Storage and Transportation

NGL and Crude Services

NGL and Crude Services

NGL and Crude Services

tractor

trailer_tanks

double_bottom_body_tanks

bbl

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill

$2,548.60

$2,552.20

$352.20

'

'

$3.20

$2,139.80

$2,149.90

[1]

'

'

$48.80

'

$728.60

$0

$1,463.20

$1,411.20

$0

Business Combination, Consideration Transferred

'

'

'

258

14.1

'

'

'

'

'

'

750

'

'

'

'

'

Business Combination, Consideration Transferred, Other

'

'

'

'

'

'

'

'

'

'

'

12.8

'

'

'

'

'

Payments to Acquire Businesses, Gross

'

'

'

'

'

'

'

'

550

'

'

'

'

'

'

'

'

Partners' Capital Account, Units, Acquisitions

'

'

'

'

'

'

'

'

8,826,125

'

'

'

'

'

'

'

'

Business Combination, Acquisition Related Costs

'

'

'

'

'

'

'

'

'

4.6

'

'

'

'

'

'

'

Business Acquisition, Cost of Acquired Entity, Cash Paid

'

'

'

'

'

12.1

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Cost of Acquired Entity, Liabilities Incurred

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Trailer Tanks, Number

'

'

'

'

'

56

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Double Bottom Tanks

'

'

'

'

'

22

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tractors

'

'

'

'

'

44

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Crude Hauling Capacity

'

'

'

'

'

25,000

'

'

'

'

'

'

'

'

'

'

'

Property, plant and equipment

'

'

'

'

'

$10.90

$2,088.10

$2,088.20

[1]

'

'

$400.20

'

'

'

'

'

'

[1]

Preliminary amount recorded as of December 31, 2013.

Acquisitions_Assets_Acquired_L

Acquisitions (Assets Acquired, Liabilities Assumed) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Mar. 31, 2014	Jun. 30, 2013		Jun. 30, 2013	Nov. 08, 2013
In Millions, unless otherwise specified				Inergy Midstream	Inergy Midstream		Inergy Midstream	Arrow Midstream Holdings, LLC
							Purchase Price Allocation Adjustments
Change in Accounting Estimate [Line Items]	'	'	'	'	'		'	'
Current assets	'	'	'	$224.50	$224.50	[1]	$0	$191.10
Property, plant and equipment	'	'	'	2,088.10	2,088.20	[1]	-0.1	400.2
Intangible assets	'	'	'	337.5	337.5	[1]	0	323.4
Other assets	'	'	'	12.7	12.7	[1]	0	19.5
Total identifiable assets acquired	'	'	'	2,662.80	2,662.90	[1]	-0.1	934.2
Current liabilities	'	'	'	207.6	207.5	[1]	0.1	215.3
Asset Retirement Obligation	'	'	'	'	'		'	1.2
Long-term debt	'	'	'	1,079.30	1,079.30	[1]	0	'
Other long-term liabilities	'	'	'	146.6	146.6	[1]	0	3.7
Total liabilities assumed	'	'	'	1,433.50	1,433.40	[1]	0.1	220.2
Net identifiable assets acquired	'	'	'	1,229.30	1,229.50	[1]	-0.2	714
Goodwill	2,548.60	2,552.20	352.2	2,139.80	2,149.90	[1]	-10.1	48.8
Net assets acquired	'	'	'	$3,369.10	$3,379.40	[1]	($10.30)	$762.80
[1]	Preliminary amount recorded as of December 31, 2013.

Acquisitions_Pro_Forma_Revenue

Acquisitions (Pro Forma Revenues) (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2013
Business Acquisition [Line Items]	'
Revenue	$811.30
Net income (loss)	$6.90
Business Acquisition, Pro Forma Earnings Per Share, Basic	$0.06	[1]
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$0.06	[1]
[1]	Basic and diluted net income per limited partner unit for the three months ended March 31, 2013 were computed based on the presumption that the common and subordinated units issued to acquire Legacy Crestwood GP (the accounting predecessor) were outstanding for the entire period prior to the June 19, 2013 acquisition.

Investments_in_Unconsolidated_1

Investments in Unconsolidated Affiliates (Details) (USD $)

3 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Mar. 31, 2014

Mar. 31, 2013

Dec. 31, 2013

Jan. 08, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Jul. 19, 2013

Dec. 31, 2013

Jackalope Gas Gathering Services, L.L.C.

Jackalope Gas Gathering Services, L.L.C.

Powder River Basin Industrial Complex, LLC

Powder River Basin Industrial Complex, LLC

Crude Logistics LLC

RKI Exploration and Production, LLC's

RKI Exploration and Production, LLC's

RKI Exploration and Production, LLC's

Majority Shareholder

Powder River Basin Industrial Complex, LLC

Jackalope Gas Gathering Services, L.L.C.

Crestwood Niobrara LLC

Crestwood Niobrara LLC

Powder River Basin Industrial Complex, LLC

Schedule of Equity Method Investments [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Percentage of Voting Interests Acquired

'

'

'

65.00%

'

'

'

'

'

'

'

50.00%

'

Business Combination, Consideration Transferred

'

'

'

$258

'

'

'

'

'

'

'

'

'

Loss from unconsolidated affiliates, net

-0.1

0

'

'

'

'

'

'

'

'

'

'

-0.4

Equity Method Investment, Difference Between Carrying Amount and Underlying Equity

'

'

'

'

'

'

'

'

'

56

'

'

'

Amortization

'

'

'

'

'

'

'

'

'

0.8

'

'

'

Payments to Acquire Equity Method Investments

19.8

0

'

'

'

'

'

'

2.5

'

17.3

'

'

Investment in unconsolidated affiliates (Note 5)

171.1

'

151.4

'

144.8

127.2

26.3

24.2

'

'

'

'

'

Share of Net Earnings In Unconsolidated Affiliate

'

'

'

'

'

'

'

'

'

$1.10

'

'

'

Equity Method Investment, Ownership Percentage

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

Earnings_Per_Limited_Partner_U1

Earnings Per Limited Partner Unit	3 Months Ended
	Mar. 31, 2014
CMLP	'
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'
Incentive Distribution Rights, Percent	50.00%
CMLP | Maximum | General Partner [Member]	'
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'
Incentive Distribution Rights, Percent	100.00%
Legacy Crestwood | Maximum | General Partner [Member]	'
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'
Incentive Distribution Rights, Percent	100.00%

Fair_Value_Measurements_Schedu

Fair Value Measurements (Schedule of Carrying Values and Estimated Fair Values of Senior Notes) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Debt Instrument [Line Items]	'	'
Senior Notes	$11.40	$11.40
Long-term Debt	2,391.30	2,266
Notes Payable, Fair Value Disclosure	11.6	11.6
Nrgm Credit Facility	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	'	500
CMLP | Crestwood Midstream Senior Notes	'	'
Debt Instrument [Line Items]	'	'
Notes Payable, Fair Value Disclosure	624	617.3
CMLP | Senior Notes	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	351.2	351.2
Notes Payable, Fair Value Disclosure	381.5	379.3
CMLP | Nrgm Credit Facility	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	504.5	504.7
Notes Payable, Fair Value Disclosure	$528.40	$513.80

Risk_Management_Notional_Amoun

Risk Management (Notional Amounts and Terms of Company's Derivative Financial Instruments) (Details)	Mar. 31, 2014	Dec. 31, 2013
	bbl	bbl
Propane Crude And Heating Oil [Member] | Fixed Price Payor	'	'
Derivative [Line Items]	'	'
Propane, crude and heating oil (barrels)	4,400,000	5,600,000
Propane Crude And Heating Oil [Member] | Fixed Price Receiver	'	'
Derivative [Line Items]	'	'
Propane, crude and heating oil (barrels)	4,500,000	6,800,000
Natural Gas [Member] | Fixed Price Payor	'	'
Derivative [Line Items]	'	'
Propane, crude and heating oil (barrels)	100,000	0
Natural Gas [Member] | Fixed Price Receiver	'	'
Derivative [Line Items]	'	'
Propane, crude and heating oil (barrels)	100,000	0

Fair_Value_Measurements_Assets

Fair Value Measurements (Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Assets from price risk management	$10.10		$14.50
SPH units	5.9		6.7
Total assets at fair value	16		21.2
Liabilities from price risk management	6		34.9
Interest rate swaps	3.7		4.3
Total liabilities at fair value	9.7		39.2
Level 1	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Assets from price risk management	0.1		0.3
SPH units	5.9		6.7
Total assets at fair value	6		7
Liabilities from price risk management	0.1		0.1
Interest rate swaps	0		0
Total liabilities at fair value	0.1		0.1
Level 2	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Assets from price risk management	10.2		27.7
SPH units	0		0
Total assets at fair value	10.2		27.7
Liabilities from price risk management	8.8		39.5
Interest rate swaps	3.7		4.3
Total liabilities at fair value	12.5		43.8
Level 3	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Assets from price risk management	0		0
SPH units	0		0
Total assets at fair value	0		0
Liabilities from price risk management	0		0
Interest rate swaps	0		0
Total liabilities at fair value	0		0
Total	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Assets from price risk management	10.3		28
SPH units	5.9		6.7
Total assets at fair value	16.2		34.7
Liabilities from price risk management	8.9		39.6
Interest rate swaps	3.7		4.3
Total liabilities at fair value	12.6		43.9
Netting Agreements	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Assets from price risk management	-0.2	[1]	-13.5	[1]
SPH units	0	[1]	0	[1]
Total assets at fair value	-0.2	[1]	-13.5	[1]
Liabilities from price risk management	-2.9	[1]	-4.7	[1]
Interest rate swaps	0	[1]	0	[1]
Total liabilities at fair value	($2.90)	[1]	($4.70)	[1]
[1]	Amounts represent the impact of legally enforceable master netting agreements that allow us to settle positive and negative positions as well as cash collateral held or placed with the same counterparties.

Risk_Management_Narrative_Deta

Risk Management (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014
Derivative [Line Items]	'
Collateral posted for commodity derivative instruments	1,700,000
Commodity contract	'
Derivative [Line Items]	'
Aggregate fair value of commodity derivative instruments	1,600,000
Collateral posted for commodity derivative instruments	100,000
NYMEX margin deposit	'
Derivative [Line Items]	'
NYMEX margin deposit	5,300,000
Price Risk Contracts | Maximum	'
Derivative [Line Items]	'
Derivative, Remaining Maturity	'33 months
Derivative Contracts, Contracts Expiring in Next Twleve Months, Percent	96.30%

LongTerm_Debt_Components_Of_Lo

Long-Term Debt (Components Of Long-Term Debt) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Debt Instrument [Line Items]	'	'
Senior Notes	$11.40	$11.40
Obligations under noncompetition agreements and notes to former owners of businesses acquired	4.5	2.8
Total debt	2,391.30	2,266
Current portion of long-term debt (Note 9)	14	5.1
Total long-term debt	2,377.30	2,260.90
Revolving Loan Facility	'	'
Debt Instrument [Line Items]	'	'
Credit agreement outstanding carrying value	387.6	381
CMLP	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	'	350
Premium on senior notes	1.2	1.2
Nrgm Credit Facility	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	'	500
Liabilities, Fair Value Adjustment	'	4.7
Senior Notes, 2019 [Member] | CMLP	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	350	'
Senior Notes, 2020 [Member] | CMLP	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	500	'
Long Term Debt, Fair Value Adjustment	4.5	'
Senior Notes, 2022 | CMLP	'	'
Debt Instrument [Line Items]	'	'
Senior Notes	600	'
Senior Notes, 2022 | Senior Notes	'	'
Debt Instrument [Line Items]	'	'
Total debt	'	600
Revolving Credit Facility | Crestwood Midstream Revolver	'	'
Debt Instrument [Line Items]	'	'
Credit agreement outstanding carrying value	$532.10	$414.90

LongTerm_Debt_Narrative_Detail

Long-Term Debt (Narrative) (Detail) (USD $)

3 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

0 Months Ended

12 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Dec. 31, 2013

Dec. 07, 2012

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Dec. 20, 2013

Apr. 13, 2012

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2013

Oct. 22, 2013

Mar. 31, 2014

Dec. 31, 2013

Apr. 02, 2011

Mar. 31, 2014

Dec. 31, 2013

Oct. 07, 2013

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Oct. 07, 2013

Oct. 07, 2013

Dec. 31, 2013

Mar. 31, 2014

Crestwood Midstream Revolver

Crestwood Equity Partners LP

Credit Agreement

Interest Rate Swap, Maturing 2016 [Member]

Minimum

Revolving Loan Facility

Revolving Loan Facility

Revolving Loan Facility

Revolving Loan Facility

Nrgm Credit Facility

CMLP

Senior Notes

Senior Notes

Senior Notes

Senior Notes

Revolving Loan Facility

Revolving Loan Facility

Revolving Loan Facility

Nrgm Credit Facility

Nrgm Credit Facility

Nrgm Credit Facility

Senior Notes, 2019 [Member]

Senior Notes, 2020 [Member]

Senior Notes, 2022

Swing Line Loans [Member]

Standby Letters of Credit

Revolving Credit Facility

Revolving Credit Facility

swap

Credit Agreement

Amended and Restated

Amended and Restated

Minimum

Maximum

Crestwood Midstream Partners LP and Crestwood Midstream Finance Corp [Member]

CMLP

CMLP

CMLP Senior Notes

CMLP

CMLP

CMLP

CMLP

CMLP

CMLP

Crestwood Midstream Revolver

Crestwood Midstream Revolver

Crestwood Midstream Revolver

Crestwood Midstream Revolver

LIBO Rate

LIBO Rate

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit agreement outstanding carrying value

'

'

'

'

'

'

'

'

'

'

$550,000,000

'

'

'

'

'

'

'

'

'

'

$1,000,000,000

'

'

'

'

'

'

$25,000,000

$250,000,000

'

'

Credit agreement outstanding carrying value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

387,600,000

381,000,000

'

'

'

'

'

'

'

'

'

414,900,000

532,100,000

Line of Credit Facility, Interest Rate at Period End

'

'

'

'

'

'

'

'

'

'

'

2.66%

4.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit Agreement amount available

'

'

'

'

'

'

101,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letters of credit outstanding

'

'

'

'

'

'

61,000,000

'

'

'

'

'

'

31,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Unused Borrowing Capacity, Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

436,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total Funded Debt to Consolidated Ebitda

'

'

'

'

5.06

4.23

'

'

'

4.75

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total Funded Debt to Consolidated Ebitda, Temporary

'

'

'

'

'

'

'

'

'

5.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Consolidated Ebitda To Consolidated Interest Expense

'

'

'

'

3.61

7.51

'

'

2.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Interest Rate Derivatives Held

'

'

'

'

'

'

'

6

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of Long-term Debt

372,600,000

157,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fixed rate, range low end

0.84%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fixed rate, range high end

2.52%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate notional amount, cash flow hedges

225,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior Notes

11,400,000

'

11,400,000

'

'

'

'

'

'

'

'

'

'

'

350,000,000

'

351,200,000

351,200,000

'

'

'

'

500,000,000

504,500,000

504,700,000

350,000,000

500,000,000

600,000,000

'

'

'

'

Line of Credit Facility, Expiration Period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

Debt, Weighted Average Interest Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.71%

'

Debt Instrument, Interest Rate, Stated Percentage

7.00%

'

'

6.00%

'

'

'

'

'

'

'

'

'

'

'

6.13%

'

'

7.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt, Fair Value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$4,700,000

'

'

'

'

'

'

'

'

'

Consolidated Leverage Ratio Maximum

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5

'

Consolidated Leverage Ratio, Maximum, Post Acquisitions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.5

'

Interest Coverage Ratio Minimum

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.5

'

Partners_Capital_Narrative_Det

Partners' Capital (Narrative) (Details) (USD $)

3 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

In Millions, except Share data, unless otherwise specified

Mar. 31, 2014

Mar. 31, 2013

Jan. 08, 2013

Mar. 31, 2013

Aug. 31, 2012

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2013

Apr. 17, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Jan. 08, 2013

Jan. 08, 2013

Mar. 31, 2014

Apr. 30, 2014

Jan. 08, 2013

Legacy Crestwood

Suburban Propane Partners L P [Member]

Non-Controlling Partners

Cash Distribution

Cash Distribution

Cash Distribution

Jackalope Gas Gathering Services, L.L.C.

Jackalope Gas Gathering Services, L.L.C.

Jackalope Gas Gathering Services, L.L.C.

Legacy Crestwood Credit Facility [Member]

Preferred Units [Member]

Preferred Units [Member]

Preferred Units [Member]

General Partner [Member]

Subsequent Event

Crestwood Niobrara LLC

Non-Controlling Partners

Crestwood Niobrara LLC

Crestwood Niobrara LLC

Subsequent Event

Distribution Made to Member or Limited Partner [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Incentive Distribution, Distribution

$25.60

$4.10

'

$4.10

'

'

'

'

'

'

'

'

'

'

'

'

'

Distribution Made to Member or Limited Partner, Distributions Declared, Per Unit

'

'

'

'

'

'

'

'

$0.14

'

'

'

'

'

'

'

'

Payments of Ordinary Dividends, Noncontrolling Interest

74.1

21

'

'

'

'

74.1

21

'

'

'

'

'

'

'

'

'

Proceeds from Noncontrolling Interests, Additional Capital Contributions

'

'

'

'

'

12.3

'

'

'

'

'

108.4

'

'

'

'

'

Distribution Made to Member or Limited Partner, Share Distribution

'

'

'

'

'

'

'

'

'

'

'

'

'

6,190,469

2,210,294

2,536,010

133,060

Limited Liability Company L L C Or Limited Partnership L P Members Or Limited Partners Ownership Interest Shares

'

'

'

'

142,004

'

'

'

'

'

'

'

'

'

'

'

'

Net Income (Loss) Attributable to Noncontrolling Interest

-6.4

-1.2

'

'

'

'

'

'

'

3.1

'

'

'

'

'

'

'

Percent of Contributions to be Funded by Units

'

'

'

'

'

'

'

'

'

'

75.00%

'

'

'

'

'

'

Funds from Capital Contributions, Maximum

'

'

'

'

'

'

'

'

'

'

41.6

'

'

'

'

'

'

Business Acquisition, Percentage of Voting Interests Acquired

'

'

65.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Consideration Transferred

'

'

$258

'

'

'

'

'

'

'

'

'

$129

'

'

'

'

Partners_Capital_Schedule_of_P

Partners' Capital Schedule of Partners' Capital Account, Distriubtions (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014
Statement of Partners' Capital [Abstract]	'
Distribution Made to Member or Limited Partner, Date of Record	7-Feb-14
Distribution Made to Member or Limited Partner, Distribution Date	14-Feb-14
Distribution Made to Member or Limited Partner, Distributions Paid, Per Unit	$0.14
Distribution Made to Member or Limited Partner, Cash Distributions Paid	$25.60

LongTerm_Incentive_Plans_Restr

Long-Term Incentive Plans (Restricted Unit Activity) (Details) (Restricted Stock Units (RSUs), USD $)	3 Months Ended
	Mar. 31, 2014
Crestwood LTIP	'
Units	'
Unvested - January 1, 2014	493,543
Vested - restricted units	-129,218
Granted - restricted units	1,292,758
Unvested - March 31, 2014	1,657,083
Weighted-Average Grant Date Fair Value	'
Unvested - January 1, 2014	$13.96
Vested - restricted units	$13.96
Granted - restricted units	$13.29
Unvested - March 31, 2014	$13.44
Crestwood Midstream LTIP	'
Units	'
Unvested - January 1, 2014	250,557
Vested - restricted units	-20,568
Granted - restricted units	757,902
Unvested - March 31, 2014	987,891
Weighted-Average Grant Date Fair Value	'
Unvested - January 1, 2014	$22.13
Vested - restricted units	$21.68
Granted - restricted units	$23.41
Unvested - March 31, 2014	$23.13

LongTerm_Incentive_Plans_Narra

Long-Term Incentive Plans (Narrative) (Details) (USD $)	3 Months Ended				3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
		Crestwood LTIP	Crestwood LTIP	Crestwood LTIP	Crestwood LTIP	Crestwood Midstream LTIP	Crestwood Midstream LTIP	Crestwood Midstream LTIP	Crestwood Midstream LTIP	Crestwood Midstream LTIP
			Restricted Stock Units (RSUs)	Restricted Stock Units (RSUs)	CMLP			Restricted Stock Units (RSUs)	CMLP	CMLP
									Restricted Stock Units (RSUs)	Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'	'	'	'	'	'
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	'	'	$15.30	$1.60	'	'	'	'	$16.40	$1.80
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	'3 years	'	'	'	'	'	'	'	'	'
Allocated Share-based Compensation Expense	'	2.5	'	'	'	2.9	0.6	'	'	'
Share Based Compensation Expense Allocated to Subsidiary	'	'	'	'	1.7	'	'	'	'	'
Share-based Compensation Arrangement, Equity Instruments Other than Options, Grants in Period, Fair Value	'	'	$17.20	'	'	'	'	$17.70	'	'
Common Stock, Capital Shares Reserved for Future Issuance	'	'	8,134,677	'	'	'	'	6,391,871	'	'
Shares Paid for Tax Withholding for Share Based Compensation	'	47,800	'	'	'	7,456	1,529	'	'	'

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	3 Months Ended						1 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Mar. 26, 2012	Dec. 31, 2013	Dec. 31, 2013	Mar. 31, 2014	Nov. 08, 2013
		Antero	Antero	Antero	Class Action Challenging Crestwood Merger	Class Action Challenging Crestwood Merger - Federal	Arrow Acquisition Class Action Lawsuit	Arrow Acquisition Class Action Lawsuit
					Lawsuit	Lawsuit	defendant	people
								bbl
Purchase Commitment, Excluding Long-term Commitment [Line Items]	'	'	'	'	'	'	'	'
Number of putative class action lawsuits	'	'	'	'	5	4	'	'
Barrels of Oil Equivalents Spilled	'	'	'	'	'	'	'	50,000
Loss Contingency, Loss of Life, Number	'	'	'	'	'	'	'	47
Loss Contingency, Number of Defendants	'	'	'	'	'	'	53	'
Loss Contingency Accrual, at Carrying Value	$100,000	'	'	'	'	'	'	'
Business Acquisition, Contingent Consideration, Potential Cash Payment	'	'	'	40,000,000	'	'	'	'
Business Acquisition, Contingent Consideration, at Fair Value	'	$33,500,000	$31,400,000	'	'	'	'	'
Fair Value Inputs, Discount Rate	5.90%	'	'	'	'	'	'	'

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013	Dec. 31, 2013
Related Party Transaction [Line Items]	'		'	'
Gathering and processing revenues	$0.90		$25.60	'
Affiliated Entity	'		'	'
Related Party Transaction [Line Items]	'		'	'
Gathering and processing revenues	0.9	[1]	25.6	'
Gathering and processing costs of goods sold	11	[1]	6.8	'
General and administrative expenses	3.8	[1]	5.8	'
Related Party Transaction, Due from (to) Related Party [Abstract]	'		'	'
Accounts receivable	0.5		'	0
Accounts payable	$6.60		'	$3.60
[1]	Concurrent with the Crestwood Merger, Quicksilver Resources Inc. (Quicksilver) is no longer a related party, and as a result our transactions with Quicksilver subsequent to June 19, 2013, are now considered non-affiliated transactions.

Segments_Reconciliation_of_Net

Segments (Reconciliation of Net Income (Loss) to EBITDA) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting [Abstract]	'	'
Net income	$13.20	$3.90
Interest and debt expense, net	31.7	11.4
Provision for income taxes	0.8	0.4
Depreciation, amortization and accretion	66.3	22.4
EBITDA	$112	$38.10

Segments_Summary_Of_Segment_In

Segments (Summary Of Segment Information) (Details) (USD $)

3 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Mar. 31, 2014

Mar. 31, 2013

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Jun. 19, 2013

Mar. 31, 2014

Mar. 31, 2013

Jun. 19, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

segment

customer

Gathering and Processing Operations

Gathering and Processing Operations

NGL and Crude Services

NGL and Crude Services

NGL and Crude Services

Storage and Transportation

Storage and Transportation

Storage and Transportation

Corporate

Corporate

QEP Energy Company [Member]

Tesoro Refining and Marketing Company [Member]

Revenue

Revenue

Accounts Receivable [Member]

Accounts Receivable [Member]

customer

customer

customer

Quicksilver

Antero

QEP Energy Company [Member]

Tesoro Refining and Marketing Company [Member]

Customer Concentration Risk

Customer Concentration Risk

Number Of Customers Representing Ten Percent Or More Of Consolidated Revenues

0

2

'

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

Number of Operating Segments

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information, Additional Information [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Operating revenues

$971.60

$72.40

'

$79.50

$72.40

$841.10

$0

'

$51

$0

'

$0

$0

'

'

'

'

'

'

Costs of product/services sold

786

13.5

'

18.7

13.5

760.5

0

'

6.8

0

'

0

0

'

'

'

'

'

'

Operations and maintenance

44.1

13

'

13.4

13

24.5

0

'

6.2

0

'

0

0

'

'

'

'

'

'

General and administrative

27.9

7.8

'

0

0

0

0

'

0

0

'

27.9

7.8

'

'

'

'

'

'

Gain on contingent consideration

-2.1

'

'

-2.1

'

0

'

'

0

'

'

0

'

'

'

'

'

'

'

Gain on long-lived assets

0.5

0

'

0.5

'

0

'

'

0

'

'

0

'

'

'

'

'

'

'

Loss from unconsolidated affiliates, net

-0.1

0

'

0.3

'

-0.4

'

'

0

'

'

0

'

'

'

'

'

'

'

Other income

0.1

0

'

0

'

0

'

'

0

'

'

0.1

'

'

'

'

'

'

'

EBITDA

112

38.1

'

46.1

45.9

55.7

0

'

38

0

'

-27.8

-7.8

'

'

'

'

'

'

Goodwill

2,548.60

352.2

2,552.20

356.8

352.2

1,463.20

0

1,411.20

'

0

728.6

0

0

'

'

'

'

'

'

Total assets

8,480.50

2,302.90

8,523.20

2,547.80

2,279.40

3,582.10

0

'

2,162.70

0

'

187.9

23.5

'

'

'

'

'

'

Cash expenditures for property, plant and equipment

$72.80

$24.30

'

$41.70

$23.90

$25.90

$0

'

$1.60

$0

'

$3.60

$0.40

'

'

'

'

'

'

Concentration Risk, Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

35.00%

20.00%

11.00%

10.00%

Number Of Customers Representing Ten Percent Or More Of Consolidated Accounts Receivable

'

'

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

Condensed_Consolidating_Financ2

Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Current assets:	'	'	'	'
Cash and cash equivalents	$7.70	$5.20	$0	$0.10
Accounts receivable	364.3	412.6	'	'
Inventory	39.8	73.6	'	'
Total current assets	451.3	522	'	'
Property, plant and equipment, net	3,938.40	3,905.30	'	'
Other assets	32.8	31.9	'	'
Total assets	8,480.50	8,523.20	2,302.90	'
Current liabilities:	'	'	'	'
Accounts payable	317.4	379	'	'
Total current liabilities	520.9	596.1	'	'
Long-term liabilities:	'	'	'	'
Long-term debt, less current portion (Note 9)	2,377.30	2,260.90	'	'
Other long-term liabilities	140.6	140.4	'	'
Partners' Capital	815.1	831.6	'	'
Total liabilities and partners’ capital	8,480.50	8,523.20	'	'
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	5,428.30	5,508.60	'	'
Parent Company	'	'	'	'
Current assets:	'	'	'	'
Cash and cash equivalents	0.1	0.1	'	'
Accounts receivable	0	0	'	'
Inventory	0	0	'	'
Other	0	0	'	'
Total current assets	0.1	0.1	'	'
Property, plant and equipment, net	0	0	'	'
Goodwill and intangible assets, net	0	0	'	'
Investment in subsidiary	5,851.20	5,927.10	'	'
Other assets	0	0	'	'
Total assets	5,851.30	5,927.20	'	'
Current liabilities:	'	'	'	'
Accounts payable	0	0	'	'
Other current liabilities	8.2	4.2	'	'
Total current liabilities	8.2	4.2	'	'
Long-term liabilities:	'	'	'	'
Long-term debt, less current portion (Note 9)	398.2	393	'	'
Other long-term liabilities	16.6	21.4	'	'
Total long-term liabilities	414.8	414.4	'	'
Partners' capital	815.1	831.6	'	'
Interest of non-controlling partners in subsidiary	4,613.20	4,677	'	'
Partners' Capital	5,428.30	'	'	'
Total liabilities and partners’ capital	5,851.30	5,927.20	'	'
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	'	5,508.60	'	'
Guarantor Subsidiaries	'	'	'	'
Current assets:	'	'	'	'
Cash and cash equivalents	2.6	2.4	'	'
Accounts receivable	160.8	207.5	'	'
Inventory	29.1	66.6	'	'
Other	25.9	25.8	'	'
Total current assets	218.4	302.3	'	'
Property, plant and equipment, net	401.7	400.9	'	'
Goodwill and intangible assets, net	726.9	742.4	'	'
Investment in subsidiary	0	0	'	'
Other assets	9.5	10.2	'	'
Total assets	1,356.50	1,455.80	'	'
Current liabilities:	'	'	'	'
Accounts payable	160	218.3	'	'
Other current liabilities	33.1	61.6	'	'
Total current liabilities	193.1	279.9	'	'
Long-term liabilities:	'	'	'	'
Long-term debt, less current portion (Note 9)	0	0	'	'
Other long-term liabilities	109.4	109.9	'	'
Total long-term liabilities	109.4	109.9	'	'
Partners' capital	1,054	1,066	'	'
Interest of non-controlling partners in subsidiary	0	0	'	'
Partners' Capital	1,054	'	'	'
Total liabilities and partners’ capital	1,356.50	1,455.80	'	'
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	'	1,066	'	'
Non-Guarantor Subsidiaries	'	'	'	'
Current assets:	'	'	'	'
Cash and cash equivalents	5	2.7	'	'
Accounts receivable	237.3	205.1	'	'
Inventory	10.7	7	'	'
Other	13.6	10.2	'	'
Total current assets	266.6	225	'	'
Property, plant and equipment, net	3,536.70	3,504.40	'	'
Goodwill and intangible assets, net	3,160	3,170.20	'	'
Investment in subsidiary	0	0	'	'
Other assets	194.4	173.1	'	'
Total assets	7,157.70	7,072.70	'	'
Current liabilities:	'	'	'	'
Accounts payable	191.2	160.7	'	'
Other current liabilities	162.2	156.7	'	'
Total current liabilities	353.4	317.4	'	'
Long-term liabilities:	'	'	'	'
Long-term debt, less current portion (Note 9)	1,979.10	1,867.90	'	'
Other long-term liabilities	28	26.3	'	'
Total long-term liabilities	2,007.10	1,894.20	'	'
Partners' capital	184	184.1	'	'
Interest of non-controlling partners in subsidiary	4,613.20	4,677	'	'
Partners' Capital	4,797.20	'	'	'
Total liabilities and partners’ capital	7,157.70	7,072.70	'	'
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	'	4,861.10	'	'
Consolidation, Eliminations	'	'	'	'
Current assets:	'	'	'	'
Cash and cash equivalents	0	0	'	'
Accounts receivable	-33.8	0	'	'
Inventory	0	0	'	'
Other	0	-5.4	'	'
Total current assets	-33.8	-5.4	'	'
Property, plant and equipment, net	0	0	'	'
Goodwill and intangible assets, net	0	0	'	'
Investment in subsidiary	-5,851.20	-5,927.10	'	'
Other assets	0	0	'	'
Total assets	-5,885	-5,932.50	'	'
Current liabilities:	'	'	'	'
Accounts payable	-33.8	0	'	'
Other current liabilities	0	-5.4	'	'
Total current liabilities	-33.8	-5.4	'	'
Long-term liabilities:	'	'	'	'
Long-term debt, less current portion (Note 9)	0	0	'	'
Other long-term liabilities	0	0	'	'
Total long-term liabilities	0	0	'	'
Partners' capital	-1,238	-1,250.10	'	'
Interest of non-controlling partners in subsidiary	-4,613.20	-4,677	'	'
Partners' Capital	-5,851.20	'	'	'
Total liabilities and partners’ capital	-5,885	-5,932.50	'	'
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	'	-5,927.10	'	'
Consolidated Entities	'	'	'	'
Current assets:	'	'	'	'
Cash and cash equivalents	7.7	5.2	'	'
Accounts receivable	364.3	412.6	'	'
Inventory	39.8	73.6	'	'
Other	39.5	30.6	'	'
Total current assets	451.3	522	'	'
Property, plant and equipment, net	3,938.40	3,905.30	'	'
Goodwill and intangible assets, net	3,886.90	3,912.60	'	'
Investment in subsidiary	0	0	'	'
Other assets	203.9	183.3	'	'
Total assets	8,480.50	8,523.20	'	'
Current liabilities:	'	'	'	'
Accounts payable	317.4	379	'	'
Other current liabilities	203.5	217.1	'	'
Total current liabilities	520.9	596.1	'	'
Long-term liabilities:	'	'	'	'
Long-term debt, less current portion (Note 9)	2,377.30	2,260.90	'	'
Other long-term liabilities	154	157.6	'	'
Total long-term liabilities	2,531.30	2,418.50	'	'
Partners' capital	815.1	831.6	'	'
Interest of non-controlling partners in subsidiary	4,613.20	4,677	'	'
Partners' Capital	5,428.30	'	'	'
Total liabilities and partners’ capital	8,480.50	8,523.20	'	'
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	'	$5,508.60	'	'

Condensed_Consolidating_Financ3

Condensed Consolidating Financial Information (Condensed Consolidating Statements Of Operations) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenues:	'	'
Gathering and processing revenues	$0.90	$25.60
Total revenue	971.6	72.4
Costs of product/services sold (excluding depreciation, amortization and accretion as shown below):	'	'
Related party (Note 13)	11	6.8
Cost of product/services sold	786	13.5
Expenses:	'	'
General and administrative	27.9	7.8
Operating income	45.7	15.7
Other income (expense):	'	'
Income before income taxes	14	4.3
Provision for income taxes	0.8	0.4
Net income	13.2	3.9
Net income attributable to non-controlling partners in subsidiary	6.4	1.2
Net income attributable to Crestwood Equity Partners LP	19.6	5.1
Parent Company	'	'
Revenues:	'	'
Gathering and processing	0	'
NGL and crude services	0	'
Storage and transportation	0	'
Gathering and processing revenues	0	'
Total revenue	0	'
Costs of product/services sold (excluding depreciation, amortization and accretion as shown below):	'	'
Gathering and processing	0	'
NGL and crude services	0	'
Storage and transportation	0	'
Related party (Note 13)	0	'
Cost of product/services sold	0	'
Expenses:	'	'
Operations and maintenance	0	'
General and administrative	0	'
Depreciation, amortization and accretion	0	'
Other	0	'
Operating income	0	'
Other income (expense):	'	'
Interest and debt expense, net	-3.6	'
Other	0	'
Equity in net income of subsidiary	16.8	'
Income before income taxes	13.2	'
Provision for income taxes	0	'
Net income	13.2	'
Net income attributable to non-controlling partners in subsidiary	0	'
Net income attributable to Crestwood Equity Partners LP	13.2	'
Guarantor Subsidiaries	'	'
Revenues:	'	'
Gathering and processing	0	'
NGL and crude services	431.2	'
Storage and transportation	6.7	'
Gathering and processing revenues	0	'
Total revenue	437.9	'
Costs of product/services sold (excluding depreciation, amortization and accretion as shown below):	'	'
Gathering and processing	0	'
NGL and crude services	384.3	'
Storage and transportation	3.6	'
Related party (Note 13)	3.3	'
Cost of product/services sold	391.2	'
Expenses:	'	'
Operations and maintenance	16.1	'
General and administrative	3.8	'
Depreciation, amortization and accretion	10.7	'
Other	0	'
Operating income	16.1	'
Other income (expense):	'	'
Interest and debt expense, net	0	'
Other	0.1	'
Equity in net income of subsidiary	0	'
Income before income taxes	16.2	'
Provision for income taxes	0.1	'
Net income	16.1	'
Net income attributable to non-controlling partners in subsidiary	0	'
Net income attributable to Crestwood Equity Partners LP	16.1	'
Non-Guarantor Subsidiaries	'	'
Revenues:	'	'
Gathering and processing	78.6	'
NGL and crude services	409.9	'
Storage and transportation	44.3	'
Gathering and processing revenues	4.2	'
Total revenue	537	'
Costs of product/services sold (excluding depreciation, amortization and accretion as shown below):	'	'
Gathering and processing	7.7	'
NGL and crude services	376.2	'
Storage and transportation	3.2	'
Related party (Note 13)	11	'
Cost of product/services sold	398.1	'
Expenses:	'	'
Operations and maintenance	28	'
General and administrative	24.1	'
Depreciation, amortization and accretion	55.6	'
Other	1.6	'
Operating income	29.6	'
Other income (expense):	'	'
Interest and debt expense, net	-28.1	'
Other	-0.1	'
Equity in net income of subsidiary	0	'
Income before income taxes	1.4	'
Provision for income taxes	0.7	'
Net income	0.7	'
Net income attributable to non-controlling partners in subsidiary	6.4	'
Net income attributable to Crestwood Equity Partners LP	7.1	'
Consolidation, Eliminations	'	'
Revenues:	'	'
Gathering and processing	0	'
NGL and crude services	0	'
Storage and transportation	0	'
Gathering and processing revenues	-3.3	'
Total revenue	-3.3	'
Costs of product/services sold (excluding depreciation, amortization and accretion as shown below):	'	'
Gathering and processing	0	'
NGL and crude services	0	'
Storage and transportation	0	'
Related party (Note 13)	-3.3	'
Cost of product/services sold	-3.3	'
Expenses:	'	'
Operations and maintenance	0	'
General and administrative	0	'
Depreciation, amortization and accretion	0	'
Other	0	'
Operating income	0	'
Other income (expense):	'	'
Interest and debt expense, net	0	'
Other	0	'
Equity in net income of subsidiary	-16.8	'
Income before income taxes	-16.8	'
Provision for income taxes	0	'
Net income	-16.8	'
Net income attributable to non-controlling partners in subsidiary	0	'
Net income attributable to Crestwood Equity Partners LP	-16.8	'
Consolidated Entities	'	'
Revenues:	'	'
Gathering and processing	78.6	'
NGL and crude services	841.1	'
Storage and transportation	51	'
Gathering and processing revenues	0.9	'
Total revenue	971.6	'
Costs of product/services sold (excluding depreciation, amortization and accretion as shown below):	'	'
Gathering and processing	7.7	'
NGL and crude services	760.5	'
Storage and transportation	6.8	'
Related party (Note 13)	11	'
Cost of product/services sold	786	'
Expenses:	'	'
Operations and maintenance	44.1	'
General and administrative	27.9	'
Depreciation, amortization and accretion	66.3	'
Other	1.6	'
Operating income	45.7	'
Other income (expense):	'	'
Interest and debt expense, net	-31.7	'
Other	0	'
Equity in net income of subsidiary	0	'
Income before income taxes	14	'
Provision for income taxes	0.8	'
Net income	13.2	'
Net income attributable to non-controlling partners in subsidiary	6.4	'
Net income attributable to Crestwood Equity Partners LP	$19.60	'

Condensed_Consolidating_Financ4

Condensed Consolidating Financial Information (Condensed Consolidating Statements of Comprehensive Income) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]	'	'
Net income	$13.20	$3.90
Comprehensive income (loss)	12.4	3.9
Parent Company	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net income	13.2	'
Change in unrealized fair value on cash flow hedges (Note 2)	-0.8	'
Comprehensive income (loss)	12.4	'
Guarantor Subsidiaries	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net income	16.1	'
Change in unrealized fair value on cash flow hedges (Note 2)	0	'
Comprehensive income (loss)	16.1	'
Non-Guarantor Subsidiaries	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net income	0.7	'
Change in unrealized fair value on cash flow hedges (Note 2)	0	'
Comprehensive income (loss)	0.7	'
Consolidation, Eliminations	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net income	-16.8	'
Change in unrealized fair value on cash flow hedges (Note 2)	0	'
Comprehensive income (loss)	-16.8	'
Consolidated Entities	'	'
Condensed Financial Statements, Captions [Line Items]	'	'
Net income	13.2	'
Change in unrealized fair value on cash flow hedges (Note 2)	-0.8	'
Comprehensive income (loss)	$12.40	'

Condensed_Consolidating_Financ5

Condensed Consolidating Financial Information (Condensed Consolidating Statements Of Cash Flows) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities	$72.30	$34.10
Cash flows from investing activities:	'	'
Acquisitions, net of cash acquired	-12.1	0
Purchases of property, plant and equipment	-72.8	-24.3
Investment in unconsolidated affiliates	-19.8	0
Net cash used in investing activities	-104.7	-24.3
Cash flows from financing activities:	'	'
Proceeds from the issuance of long-term debt	496.4	199.5
Principal payments on long-term debt	-372.6	-157
Distributions to partners	-25.6	-4.1
Distributions paid to non-controlling partners	-74.1	-21
Net proceeds from the issuance of common units	0	103.5
Proceeds from issuance of preferred equity of subsidiary, net	12.3	0
Net cash provided by (used in) financing activities	34.9	-9.9
Net increase (decrease) in cash	2.5	-0.1
Cash at beginning of period	5.2	0.1
Cash at end of period	7.7	0
Parent Company	'	'
Cash flows from operating activities	0	'
Cash flows from investing activities:	'	'
Acquisitions, net of cash acquired	0	'
Purchases of property, plant and equipment	0	'
Investment in unconsolidated affiliates	0	'
Proceeds from sale of assets	36.1	'
Net cash used in investing activities	36.1	'
Cash flows from financing activities:	'	'
Proceeds from the issuance of long-term debt	0	'
Principal payments on long-term debt	0	'
Distributions to partners	-36.1	'
Distributions paid to non-controlling partners	0	'
Proceeds from issuance of preferred equity of subsidiary, net	0	'
Other	0	'
Net cash provided by (used in) financing activities	-36.1	'
Net increase (decrease) in cash	0	'
Cash at beginning of period	0.1	'
Cash at end of period	0.1	'
Guarantor Subsidiaries	'	'
Cash flows from operating activities	14.2	'
Cash flows from investing activities:	'	'
Acquisitions, net of cash acquired	0	'
Purchases of property, plant and equipment	-5.1	'
Investment in unconsolidated affiliates	0	'
Proceeds from sale of assets	10.5	'
Net cash used in investing activities	5.4	'
Cash flows from financing activities:	'	'
Proceeds from the issuance of long-term debt	190.4	'
Principal payments on long-term debt	-183.8	'
Distributions to partners	-25.6	'
Distributions paid to non-controlling partners	0	'
Proceeds from issuance of preferred equity of subsidiary, net	0	'
Other	-0.4	'
Net cash provided by (used in) financing activities	-19.4	'
Net increase (decrease) in cash	0.2	'
Cash at beginning of period	2.4	'
Cash at end of period	2.6	'
Non-Guarantor Subsidiaries	'	'
Cash flows from operating activities	58.1	'
Cash flows from investing activities:	'	'
Acquisitions, net of cash acquired	-12.1	'
Purchases of property, plant and equipment	-67.7	'
Investment in unconsolidated affiliates	-19.8	'
Proceeds from sale of assets	0	'
Net cash used in investing activities	-99.6	'
Cash flows from financing activities:	'	'
Proceeds from the issuance of long-term debt	306	'
Principal payments on long-term debt	-188.8	'
Distributions to partners	-10.5	'
Distributions paid to non-controlling partners	-74.1	'
Proceeds from issuance of preferred equity of subsidiary, net	12.3	'
Other	-1.1	'
Net cash provided by (used in) financing activities	43.8	'
Net increase (decrease) in cash	2.3	'
Cash at beginning of period	2.7	'
Cash at end of period	5	'
Consolidation, Eliminations	'	'
Cash flows from operating activities	0	'
Cash flows from investing activities:	'	'
Acquisitions, net of cash acquired	0	'
Purchases of property, plant and equipment	0	'
Investment in unconsolidated affiliates	0	'
Proceeds from sale of assets	-46.6	'
Net cash used in investing activities	-46.6	'
Cash flows from financing activities:	'	'
Proceeds from the issuance of long-term debt	0	'
Principal payments on long-term debt	0	'
Distributions to partners	46.6	'
Distributions paid to non-controlling partners	0	'
Proceeds from issuance of preferred equity of subsidiary, net	0	'
Other	0	'
Net cash provided by (used in) financing activities	46.6	'
Net increase (decrease) in cash	0	'
Cash at beginning of period	0	'
Cash at end of period	0	'
Consolidated Entities	'	'
Cash flows from operating activities	72.3	'
Cash flows from investing activities:	'	'
Acquisitions, net of cash acquired	-12.1	'
Purchases of property, plant and equipment	-72.8	'
Investment in unconsolidated affiliates	-19.8	'
Proceeds from sale of assets	0	'
Net cash used in investing activities	-104.7	'
Cash flows from financing activities:	'	'
Proceeds from the issuance of long-term debt	496.4	'
Principal payments on long-term debt	-372.6	'
Distributions to partners	-25.6	'
Distributions paid to non-controlling partners	-74.1	'
Proceeds from issuance of preferred equity of subsidiary, net	12.3	'
Other	-1.5	'
Net cash provided by (used in) financing activities	34.9	'
Net increase (decrease) in cash	2.5	'
Cash at beginning of period	5.2	'
Cash at end of period	$7.70	'