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Fair Value Measurements (Tables)
3 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Carrying Value and Estimated Fair Value of Long-term Debt and Finance Leases, Including Current Maturities

The carrying value and estimated fair value of our total long-term debt and finance leases, including current maturities, were as follows (in millions):

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 2023

 

 

September 30, 2023

 

 

Carrying

 

 

Fair

 

 

Carrying

 

 

Fair

 

 

Value

 

 

Value

 

 

Value

 

 

Value

 

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

$

481.0

 

 

$

456.0

 

 

$

538.3

 

 

$

493.6

 

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