Long-Term Debt (Components Of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Carrying Amount	$ 500.0
Less: current portion	1.1	$ 3.7
Total long-term debt	2,542.7	2,392.8
CMLP
Debt Instrument [Line Items]
Carrying Amount	0.0	350.0
Premium on senior notes	0.0	1.0
Crestwood Midstream 2020 Senior Notes
Debt Instrument [Line Items]
Fair value adjustment	3.3	4.0
CEQP Senior Notes \| CEQP Senior Notes
Debt Instrument [Line Items]
Carrying Amount	0.0	11.4
CEQP Credit Facility \| Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Credit agreement outstanding carrying value	0.0	369.0
Crestwood Midstream Revolver \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement outstanding carrying value	735.0	555.0
Crestwood Equity Partners LP
Debt Instrument [Line Items]
Obligations under noncompetition agreements and notes to former owners of businesses acquired	0.2	0.8
Debt, Long-term and Short-term, Combined Amount	2,543.8	2,396.5
CMLP
Debt Instrument [Line Items]
Carrying Amount		500.0
Obligations under noncompetition agreements and notes to former owners of businesses acquired	5.3	5.3
Debt, Long-term and Short-term, Combined Amount	2,543.6	2,015.3
Less: current portion	0.9	0.8
Total long-term debt	2,542.7	2,014.5
CMLP \| Crestwood Midstream 2020 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	503.3	504.0
CMLP \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	0.0	351.0
CMLP \| Crestwood Midstream 2022 senior unsecured notes
Debt Instrument [Line Items]
Carrying Amount		600.0
CMLP \| Senior Notes, 2022 \| Crestwood Midstream 2022 senior unsecured notes
Debt Instrument [Line Items]
Carrying Amount	600.0
CMLP \| Senior Notes, 2023 \| Crestwood Midstream 2022 senior unsecured notes
Debt Instrument [Line Items]
Carrying Amount	$ 700.0	$ 0.0

Debt Instrument, Fair Value Adjustment

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- Definition

Obligations under noncompetition agreements and notes to former owners of businesses acquired

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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No definition available.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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