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Fair Value Measurements (Tables)
3 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Carrying Value and Estimated Fair Value of Long-term Debt, Including Current Maturities

The carrying value and estimated fair value of the Company's long-term debt, including current maturities, were as follows (in millions):

 

 

 

December 31, 2024

 

 

September 30, 2024

 

 

September 30, 2023

 

 

 

Carrying

 

 

Fair

 

 

Carrying

 

 

Fair

 

 

Carrying

 

 

Fair

 

 

 

Value

 

 

Value

 

 

Value

 

 

Value

 

 

Value

 

 

Value

 

Long-term debt and finance leases, including
   current maturities
(1)

 

$

230.6

 

 

$

219.9

 

 

$

315.2

 

 

$

305.3

 

 

$

538.3

 

 

$

493.6

 

 

Current and prior period long-term debts' carrying and fair values exclude net debt issuance costs.