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FAIR VALUE MEASUREMENTS (Tables)
12 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Estimated Fair Values for Each Type of Instrument
The estimated fair values for each type of instrument are presented below (in millions).

 September 30, 2024Level OneLevel TwoLevel Three
Asset Class:
Mutual fund investments in a non-qualified savings plan(a)
$3.1 $3.1 $— $— 
Derivatives designated as hedging instruments - natural gas instruments, net
0.6 — 0.6 — 
Total Assets$3.7 $3.1 $0.6 $— 
Liability Class:    
Derivatives designated as hedging instruments - natural gas instruments, net
$(1.9)$— $(1.9)$— 
Liabilities related to non-qualified savings plan(3.1)(3.1)— — 
Total Liabilities$(5.0)$(3.1)$(1.9)$— 
(a)Includes mutual fund investments of approximately 35% in the common stock of large-cap U.S. companies, 5% in the common stock of small to mid-cap U.S. companies, 5% in the common stock of international companies, 10% in bond funds, 5% in short-term investments and 40% in blended funds.

September 30, 2023Level OneLevel TwoLevel Three
Asset Class:
Mutual fund investments in a non-qualified savings plan(a)
$2.6 $2.6 $— $— 
Derivatives not designated as hedging instruments - natural gas instruments, net
0.1 — 0.1 — 
Total Assets$2.7 $2.6 $0.1 $— 
Liability Class:
Derivatives designated as hedging instruments - natural gas instruments, net
$(1.4)$— $(1.4)$— 
Liabilities related to non-qualified savings plan(2.6)(2.6)— — 
Total Liabilities$(4.0)$(2.6)$(1.4)$— 
(a)Includes mutual fund investments of approximately 25% in the common stock of large-cap U.S. companies, 5% in the common stock of small to mid-cap U.S. companies, 10% in the common stock of international companies, 10% in bond funds, 5% in short-term investments and 45% in blended funds.
Schedule of Fair Value of Total Contingent Consideration Arrangement
The following table presents the fair value of the Company’s total contingent consideration arrangement (in millions):
Consolidated Balance Sheet LocationSeptember 30,
2024
September 30,
2023
Accrued expenses and other current liabilities$— $7.3 
Other noncurrent liabilities7.9 31.8 
Total contingent consideration(a)
$7.9 $39.1 
(a)The decrease in total contingent consideration was related to a net $22.1 million decrease in the fair value of the remaining contingent consideration, discussed further above, and $9.1 million of payments made during the fiscal year ended September 30, 2024.