Long-Term Debt (Components Of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Carrying Amount	$ 338.8
Debt Issuance Costs, Net	34.0	$ 40.9
Less: current portion	1.0	1.1
Total long-term debt	1,522.7	2,501.8
Crestwood Midstream 2020 Senior Notes
Debt Instrument [Line Items]
Fair value adjustment	1.8	3.3
Crestwood Midstream Revolver \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement outstanding carrying value	77.0	735.0
Crestwood Equity Partners LP
Debt Instrument [Line Items]
Obligations under noncompetition agreements and notes to former owners of businesses acquired	0.0	0.2
Debt, Long-term and Short-term, Combined Amount	1,523.7	2,502.9
CMLP
Debt Instrument [Line Items]
Carrying Amount		500.0
Obligations under noncompetition agreements and notes to former owners of businesses acquired	3.7	5.3
Debt, Long-term and Short-term, Combined Amount	1,523.7	2,502.7
Less: current portion	1.0	0.9
Total long-term debt	1,522.7	2,501.8
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	436.4
CMLP \| Senior Notes, 2023 \| Crestwood Midstream 2022 senior unsecured notes
Debt Instrument [Line Items]
Carrying Amount	$ 700.0	$ 700.0

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

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

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts 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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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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