Note 7 - Fair Value Measurements (Tables)

9 Months Ended

Jun. 30, 2022

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Effects of Netting and Cash Margin Receivables /Payables			Total
As of June 30, 2022
ASSETS
Gas Utility:
U.S. stock/bond mutual funds	$	20.3	$	—	$	—		$	20.3
NYMEX/ICE natural gas contracts		39.6		—		(39.6	)		—
Gas Marketing:
NYMEX/ICE natural gas contracts		—		94.2		(94.2	)		—
Natural gas commodity contracts		—		57.6		(5.3	)		52.3
Other:
U.S. stock/bond mutual funds		31.6		—		—			31.6
Interest rate swaps		52.7		—		(7.6	)		45.1
Total	$	144.2	$	151.8	$	(146.7	)	$	149.3
LIABILITIES
Gas Utility:
NYMEX/ICE natural gas contracts	$	12.8	$	—	$	(12.8	)	$	—
Gas Marketing:
NYMEX/ICE natural gas contracts		—		60.8		(60.8	)		—
Natural gas commodity contracts		—		118.3		(5.3	)		113.0
Other:
Interest rate swaps		7.6		—		(7.6	)		—
Total	$	20.4	$	179.1	$	(86.5	)	$	113.0

	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Effects of Netting and Cash Margin Receivables /Payables			Total
As of September 30, 2021
ASSETS
Gas Utility:
U.S. stock/bond mutual funds	$	23.8	$	—	$	—		$	23.8
NYMEX/ICE natural gas contracts		104.0		—		(104.0	)		—
Gas Marketing:
NYMEX/ICE natural gas contracts		—		114.7		(93.7	)		21.0
Natural gas commodity contracts		—		35.2		(5.5	)		29.7
Other:
U.S. stock/bond mutual funds		26.2		—		—			26.2
Interest rate swaps		12.6		—		(5.2	)		7.4
Total	$	166.6	$	149.9	$	(208.4	)	$	108.1
LIABILITIES
Gas Utility:
NYMEX/ICE natural gas contracts	$	0.3	$	—	$	(0.3	)	$	—
Gas Marketing:
NYMEX/ICE natural gas contracts		—		62.0		(62.0	)		—
Natural gas commodity contracts		—		96.7		(5.5	)		91.2
Other:
Interest rate swaps		5.7		—		(5.2	)		0.5
Total	$	6.0	$	158.7	$	(73.0	)	$	91.7
As of June 30, 2021
ASSETS
Gas Utility:
U.S. stock/bond mutual funds	$	24.3	$	—	$	—		$	24.3
NYMEX/ICE natural gas contracts		25.3		—		(25.3	)		—
Gas Marketing:
NYMEX/ICE natural gas contracts		—		47.5		(47.5	)		—
Natural gas commodity contracts		—		20.2		—			20.2
Other:
U.S. stock/bond mutual funds		21.5		—		—			21.5
Interest rate swaps		—		9.0		(5.5	)		3.5
Total	$	71.1	$	76.7	$	(78.3	)	$	69.5
LIABILITIES
Gas Marketing:
NYMEX/ICE natural gas contracts	$	—	$	18.8	$	(16.0	)	$	2.8
Natural gas commodity contracts		—		57.8		—			57.8
Other:
Interest rate swaps		—		6.7		(5.5	)		1.2
Total	$	—	$	83.3	$	(21.5	)	$	61.8

	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Effects of Netting and Cash Margin Receivables /Payables			Total
As of June 30, 2022
ASSETS
U.S. stock/bond mutual funds	$	20.3	$	—	$	—		$	20.3
NYMEX/ICE natural gas contracts		39.6		—		(39.6	)		—
Total	$	59.9	$	—	$	(39.6	)	$	20.3
LIABILITIES
NYMEX/ICE natural gas contracts	$	12.8	$	—	$	(12.8	)	$	—
As of September 30, 2021
ASSETS
U.S. stock/bond mutual funds	$	23.8	$	—	$	—		$	23.8
NYMEX/ICE natural gas contracts		104.0		—		(104.0	)		—
Total	$	127.8	$	—	$	(104.0	)	$	23.8
LIABILITIES
NYMEX/ICE natural gas contracts	$	0.3	$	—	$	(0.3	)	$	—
As of June 30, 2021
ASSETS
U.S. stock/bond mutual funds	$	24.3	$	—	$	—		$	24.3
NYMEX/ICE natural gas contracts		25.3		—		(25.3	)		—
Total	$	49.6	$	—	$	(25.3	)	$	24.3