Condensed Consolidating Financial Information (Statements Of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities	$ 119.2	$ 130.9
Cash flows from investing activities:
Purchases of property, plant and equipment	(86.8)	(68.5)
Investment in unconsolidated affiliates	(6.0)	(38.2)
Payments for (Proceeds from) Other Investing Activities	0.0	(1.0)
Proceeds from Equity Method Investment, Distribution, Return of Capital	9.5	16.7
Net cash used in investing activities	(83.3)	(91.0)
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	275.9	298.9
Payments on long-term debt	(246.9)	(284.4)
Payments on finance leases	(0.8)
Payments on capital leases		(1.1)
Payments for deferred financing costs	0.0	(0.2)
Distributions to partners	(45.3)	(43.1)
Taxes paid for unit-based compensation vesting	(15.1)	(7.0)
Other	0.0	(0.1)
Net cash provided by (used in) financing activities	(56.4)	(55.3)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(20.5)	(15.4)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	5.2	1.8	$ 25.7	$ 17.2
Eliminations
Cash flows from operating activities	0.0	0.0
Cash flows from investing activities:
Purchases of property, plant and equipment	0.0	0.0
Investment in unconsolidated affiliates	0.0	0.0
Capital distributions from consolidated affiliates	(17.2)	15.6
Payments for (Proceeds from) Other Investing Activities		0.0
Proceeds from Equity Method Investment, Distribution, Return of Capital	0.0	0.0
Net cash used in investing activities	(17.2)	15.6
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	0.0	0.0
Payments on long-term debt	0.0	0.0
Payments on finance leases	0.0
Payments on capital leases		0.0
Payments for deferred financing costs		0.0
Distributions to partners	0.0	0.0
Contributions from (distributions to) parent	17.2	(15.6)
Taxes paid for unit-based compensation vesting	0.0	0.0
Change in intercompany balances	0.0	0.0
Net cash provided by (used in) financing activities	17.2	(15.6)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	0.0	0.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	0.0	0.0	0.0	0.0
Non-Guarantor Subsidiaries \| Reportable Legal Entities
Cash flows from operating activities	44.7	9.2
Cash flows from investing activities:
Purchases of property, plant and equipment	(53.2)	0.0
Investment in unconsolidated affiliates	(6.0)	(38.2)
Capital distributions from consolidated affiliates	0.0	0.0
Payments for (Proceeds from) Other Investing Activities		0.0
Proceeds from Equity Method Investment, Distribution, Return of Capital	9.5	16.7
Net cash used in investing activities	(49.7)	(21.5)
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	0.0	0.0
Payments on long-term debt	0.0	0.0
Payments on finance leases	0.0
Payments on capital leases		0.0
Payments for deferred financing costs		0.0
Distributions to partners	(9.2)	(3.3)
Contributions from (distributions to) parent	(17.2)	15.6
Taxes paid for unit-based compensation vesting	0.0	0.0
Change in intercompany balances	7.8	0.0
Net cash provided by (used in) financing activities	(18.6)	12.3
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(23.6)	0.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	0.0	0.0	23.6	0.0
Parent Company, Crestwood Midstream Partners, LP \| Reportable Legal Entities
Cash flows from operating activities	(22.3)	(38.6)
Cash flows from investing activities:
Purchases of property, plant and equipment	0.0	0.0
Investment in unconsolidated affiliates	0.0	0.0
Capital distributions from consolidated affiliates	17.2	(15.6)
Payments for (Proceeds from) Other Investing Activities		0.0
Proceeds from Equity Method Investment, Distribution, Return of Capital	0.0	0.0
Net cash used in investing activities	17.2	(15.6)
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	275.9	298.9
Payments on long-term debt	(246.9)	(284.0)
Payments on finance leases	0.0
Payments on capital leases		0.0
Payments for deferred financing costs		(0.2)
Distributions to partners	(57.0)	(57.8)
Contributions from (distributions to) parent	0.0	0.0
Taxes paid for unit-based compensation vesting	0.0	0.0
Change in intercompany balances	36.1	82.3
Net cash provided by (used in) financing activities	8.1	39.2
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	3.0	(15.0)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	4.8	1.5	1.8	16.5
Crestwood Midstream Partners LP
Cash flows from operating activities	115.8	130.9
Cash flows from investing activities:
Purchases of property, plant and equipment	(86.8)	(68.5)
Investment in unconsolidated affiliates	(6.0)	(38.2)
Capital distributions from consolidated affiliates	0.0	0.0
Payments for (Proceeds from) Other Investing Activities		(1.0)
Proceeds from Equity Method Investment, Distribution, Return of Capital	9.5	16.7
Net cash used in investing activities	(83.3)	(91.0)
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	275.9	298.9
Payments on long-term debt	(246.9)	(284.4)
Payments on finance leases	(0.8)
Payments on capital leases		(1.1)
Payments for deferred financing costs		(0.2)
Distributions to partners	(66.2)	(61.1)
Contributions from (distributions to) parent	0.0	0.0
Taxes paid for unit-based compensation vesting	(15.1)	(7.0)
Change in intercompany balances	0.0	0.0
Net cash provided by (used in) financing activities	(53.1)	(54.9)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(20.6)	(15.0)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	4.8	1.5	25.4	16.5
Guarantor Subsidiaries \| Reportable Legal Entities
Cash flows from operating activities	93.4	160.3
Cash flows from investing activities:
Purchases of property, plant and equipment	(33.6)	(68.5)
Investment in unconsolidated affiliates	0.0	0.0
Capital distributions from consolidated affiliates	0.0	0.0
Payments for (Proceeds from) Other Investing Activities		(1.0)
Proceeds from Equity Method Investment, Distribution, Return of Capital	0.0	0.0
Net cash used in investing activities	(33.6)	(69.5)
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	0.0	0.0
Payments on long-term debt	0.0	(0.4)
Payments on finance leases	(0.8)
Payments on capital leases		(1.1)
Payments for deferred financing costs		0.0
Distributions to partners	0.0	0.0
Contributions from (distributions to) parent	0.0	0.0
Taxes paid for unit-based compensation vesting	(15.1)	(7.0)
Change in intercompany balances	(43.9)	(82.3)
Net cash provided by (used in) financing activities	(59.8)	(90.8)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	0.0	0.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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- Details

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