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Fair Value Measurements (Tables)
3 Months Ended
Dec. 31, 2021
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 our long-term debt, including current maturities, were as follows (in millions):

 

 

 

December 31, 2021

 

 

September 30, 2021

 

 

 

Carrying

 

 

Fair

 

 

Carrying

 

 

Fair

 

 

 

Value

 

 

Value

 

 

Value

 

 

Value

 

Long-term debt and finance leases, including current

   maturities(1)

 

$

678.6

 

 

$

674.0

 

 

$

670.3

 

 

$

676.8

 

 

(1)

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