Fair Value Measurements (Schedule of Carrying Values and Estimated Fair Values of Senior Notes) (Details) - Crestwood Midstream Partners LP - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
2023 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	$ 689.5	$ 695.1
Fair Value	677.9	714.0
2025 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	495.2	494.4
Fair Value	458.2	514.4
2027 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	592.9	592.1
Fair Value	$ 536.3	$ 610.1

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
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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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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))
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