CONSOLIDATED STATEMENT OF PARTNERS CAPITAL (USD $) In Millions, unless otherwise specified		Total		Partners' Capital [Member]	Non Controlling Partners [Member]
Beginning Balance at Sep. 30, 2009	[1]	$ 511.4		$ 506.7	$ 4.7
Comprehensive income:
Purchase of minority interest		(18.3)		(13.8)	(4.5)
Contribution by Inergy, L.P.		18.3		18.3	0
Distributions to shareholders		(0.6)		0	(0.6)
Net distribution by US Salt, LLC to Inergy, L.P.		(5.9)		(5.9)	0
Disposal of entity, other		(0.4)		0	(0.4)
Change in unrealized fair value of cash flow hedges		0.1		0.1	0
Net income		43.2	[1]	42.4	0.8
Unit-based compensation charges		3.5
Ending Balance at Sep. 30, 2010	[1]	547.8		547.8	0
Comprehensive income:
Contribution by Inergy, L.P.		66.8		66.8	0
Net distribution by US Salt, LLC to Inergy, L.P.		(7.4)		(7.4)	0
Change in unrealized fair value of cash flow hedges		0.1		0.1	0
Net income		53.5	[1]	53.5	0
Unit-based compensation charges		1.8
Ending Balance at Sep. 30, 2011	[1]	660.8		660.8	0
Comprehensive income:
Contribution by Inergy, L.P.		152.8		152.8	0
Distributions to shareholders		(14.6)		(14.6)	0
Disposal of entity, other		0.3		0.3	0
Change in unrealized fair value of cash flow hedges		0.1		0.1	0
Net income		65.7		65.7	0
Net proceeds from issuance of common units		292.4		292.4	0
Distributions to Inergy, L.P.		(163.3)		(163.3)	0
Assumption of promissory note of Inergy, L.P.		(255.0)		(255.0)	0
Unit-based compensation charges		6.5		6.5	0
Cash paid for US Salt, LLC acquisition (Note 9)		(182.5)		(182.5)	0
Net distribution by US Salt, LLC to Inergy, L.P. prior to acquisition (Note 9)		(7.9)		(7.9)	0
Ending Balance at Sep. 30, 2012		$ 555.3		$ 555.3	$ 0

[1] Retrospectively adjusted as described in Note 1.