FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Dec. 31, 2016

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
	Carrying Amount		Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
As of December 31, 2016
Cash and cash equivalents	$	10.6	$	10.6	$	10.6	$	—	$	—
Short-term debt	506.4		506.4		—		506.4		—
Long-term debt, including current portion	2,071.3		2,258.1		—		2,258.1		—
As of September 30, 2016
Cash and cash equivalents	$	5.2	$	5.2	$	5.2	$	—	$	—
Short-term debt	398.7		398.7		—		398.7		—
Long-term debt, including current portion	2,070.7		2,257.1		—		2,257.1		—
As of December 31, 2015
Cash and cash equivalents	$	4.6	$	4.6	$	4.6	$	—	$	—
Short-term debt	377.1		377.1		—		377.1		—
Long-term debt	1,838.9		1,916.5		—		1,916.5		—

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
	Carrying Amount		Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
As of December 31, 2016
Cash and cash equivalents	$	4.0	$	4.0	$	4.0	$	—	$	—
Short-term debt	312.9		312.9		—		312.9		—
Long-term debt	804.3		910.7		—		910.7		—
As of September 30, 2016
Cash and cash equivalents	$	2.1	$	2.1	$	2.1	$	—	$	—
Short-term debt	243.7		243.7		—		243.7		—
Long-term debt	804.1		900.4		—		900.4		—
As of December 31, 2015
Cash and cash equivalents	$	1.3	$	1.3	$	1.3	$	—	$	—
Short-term debt	274.1		274.1		—		274.1		—
Long-term debt	803.6		858.5		—		858.5		—

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
	Carrying Amount		Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
As of December 31, 2016
Cash and cash equivalents	$	—	$	—	$	—	$	—	$	—
Short-term debt	102.5		102.5		—		102.5		—
Long-term debt	247.7		269.3		—		269.3		—
As of September 30, 2016
Cash and cash equivalents	$	—	$	—	$	—	$	—	$	—
Short-term debt	82.0		82.0		—		82.0		—
Long-term debt	247.6		275.5		—		275.5		—
As of December 31, 2015
Cash and cash equivalents	$	0.1	$	0.1	$	0.1	$	—	$	—
Short-term debt	43.0		43.0		—		43.0		—
Long-term debt	247.6		256.5		—		256.5		—