Fair Value Measurements (Schedule of Carrying Values and Estimated Fair Values of Senior Notes) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
2023 Senior Notes \| Crestwood Midstream Senior Notes
Debt Instrument [Line Items]
Carrying Amount	$ 700.0	$ 700.0
2023 Senior Notes \| CMLP \| Crestwood Midstream Senior Notes
Debt Instrument [Line Items]
Fair Value	714.0	668.1
Carrying Amount	695.1	693.6
2025 Senior Notes \| Crestwood Midstream Senior Notes
Debt Instrument [Line Items]
Carrying Amount	500.0	500.0
2025 Senior Notes \| CMLP \| Crestwood Midstream Senior Notes
Debt Instrument [Line Items]
Fair Value	514.4	466.2
Carrying Amount	494.4	493.4
2027 Senior Notes \| CMLP
Debt Instrument [Line Items]
Fair Value	610.1	0.0
Carrying Amount	$ 592.1	$ 0.0

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

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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.

+ References

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16(a))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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