Segments (Tables)

12 Months Ended

Sep. 30, 2012

Text Block [Abstract]

Reportable Segments

Revenues, gross profit, identifiable assets, goodwill, property, plant and equipment, total assets and expenditures for property, plant and equipment for each of the Company's reportable segments are presented below (in millions):

	Year Ended September 30, 2012
	Storage and Transportation Operations		Salt Operations		Total
Firm storage revenues	$	94.5	$	—	$	94.5
Salt revenues	—		52.0		52.0
Transportation revenues	28.4		—		28.4
Hub services revenues	14.9		—		14.9
Gross profit (excluding depreciation and amortization)	126.7		21.7		148.4
Identifiable assets	14.0		10.9		24.9
Goodwill	90.2		6.3		96.5
Property, plant and equipment	953.3		115.4		1,068.7
Total assets	925.9		102.0		1,027.9
Expenditures for property, plant and equipment	245.9		6.0		251.9

	Year Ended September 30, 2011
	Storage and Transportation Operations		Salt Operations		Total
Firm storage revenues	$	90.4	$	—	$	90.4
Salt revenues	—		52.3		52.3
Transportation revenues	14.0		—		14.0
Hub services revenues	6.5		—		6.5
Gross profit (excluding depreciation and amortization)	95.1		21.7		116.8
Identifiable assets	10.8		10.4		21.2
Goodwill	90.2		6.3		96.5
Property, plant and equipment	707.4		109.5		816.9
Total assets	702.4		111.3		813.7
Expenditures for property, plant and equipment	112.0		8.6		120.6

	Year Ended September 30, 2010
	Storage and Transportation Operations		Salt Operations		Total
Firm storage revenues	$	81.0	$	—	$	81.0
Salt revenues	—		52.2		52.2
Transportation revenues	12.1		—		12.1
Hub services revenues	1.6		—		1.6
Gross profit (excluding depreciation and amortization)	82.7		22.2		104.9
Identifiable assets	8.5		9.5		18.0
Goodwill	90.2		6.3		96.5
Property, plant and equipment	529.3		100.8		630.1
Total assets	559.6		107.9		667.5
Expenditures for property, plant and equipment	44.1		11.6		55.7