Long-Term Debt (Components Of Long-Term Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Other	$ 0.0	$ 0.2
Deferred Finance Costs, Net	39.2	40.9
Total debt	2,531.7	2,502.9
Less: current portion	0.9	1.1
Total long-term debt, less current portion	2,530.8	2,501.8
Senior Notes \| Senior Notes, 2020
Debt Instrument [Line Items]
Senior notes	500.0	500.0
Senior Notes \| Senior Notes, 2022
Debt Instrument [Line Items]
Senior notes	600.0	600.0
Senior Notes \| Senior Notes, 2023
Debt Instrument [Line Items]
Senior notes	700.0	700.0
Fair value adjustment of 2020 Senior Notes \| Senior Notes, 2020
Debt Instrument [Line Items]
Fair value adjustment	3.2	3.3
Other
Debt Instrument [Line Items]
Other	4.9	5.3
Revolving Credit Facility \| Crestwood Midstream Revolver
Debt Instrument [Line Items]
Credit agreement outstanding carrying value	762.8	735.0
Crestwood Midstream Partners LP
Debt Instrument [Line Items]
Total debt	2,531.7	2,502.7
Less: current portion	0.9	0.9
Total long-term debt, less current portion	2,530.8	2,501.8
Crestwood Midstream Partners LP \| Senior Notes, 2020
Debt Instrument [Line Items]
Senior notes	503.2	503.3
Crestwood Midstream Partners LP \| Senior Notes, 2022
Debt Instrument [Line Items]
Senior notes	600.0	600.0
Crestwood Midstream Partners LP \| Senior Notes, 2023
Debt Instrument [Line Items]
Senior notes	$ 700.0	$ 700.0

Debt Instrument, Fair Value Adjustment

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

+ References

No definition available.

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Section 02
-Paragraph 19, 20, 22
-Article 5

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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.

+ References

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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 both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Subparagraph (SX 210.7-03.16(a))
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