FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Mar. 31, 2015

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Fair value of financial instruments

The carrying amounts and estimated fair values of financial instruments not measured at fair value on a recurring basis for the Company are as follows:

					Classification of Estimated Fair Value
($ Millions)	Carrying Amount		Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
As of March 31, 2015
Cash and cash equivalents	$	46.9	$	46.9	$	46.9	$	—	$	—
Short-term debt	247.6		247.6		—		247.6		—
Long-term debt, including current portion	1,816.3		1,971.0		—		1,971.0		—
As of September 30, 2014
Cash and cash equivalents	$	16.1	$	16.1	$	16.1	$	—	$	—
Short-term debt	287.1		287.1		—		287.1		—
Long-term debt	1,851.0		1,937.3		—		1,937.3		—

Laclede Gas

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Fair value of financial instruments

The carrying amounts and estimated fair values of financial instruments not measured at fair value on a recurring basis for Laclede Gas are as follows:

					Classification of Estimated Fair Value
($ Millions)	Carrying Amount		Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
As of March 31, 2015
Cash and cash equivalents	$	9.3	$	9.3	$	9.3	$	—	$	—
Short-term debt	153.0		—		—		153.0		—
Long-term debt	808.0		909.5		—		909.5		—
As of September 30, 2014
Cash and cash equivalents	$	3.7	$	3.7	$	3.7	$	—	$	—
Short-term debt	238.6		238.6		—		238.6		—
Long-term debt	807.9		876.2		—		876.2		—

Alagasco

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Fair value of financial instruments

The carrying amounts and estimated fair values of financial instruments not measured at fair value on a recurring basis for Alagasco are as follows:

					Classification of Estimated Fair Value
($ Millions)	Carrying Amount		Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
As of March 31, 2015
Cash and cash equivalents	$	35.4	$	35.4	$	35.4	$	—	$	—
Short-term debt	25.0		25.0		—		25.0		—
Long-term debt, including current portion	215.0		235.1		—		235.1		—
As of September 30, 2014
Cash and cash equivalents	$	5.6	$	5.6	$	5.6	$	—	$	—
Short-term debt	16.0		16.0		—		16.0		—
Long-term debt	249.8		266.4		—		266.4		—