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Fair Value Measurements (Tables)
3 Months Ended
Dec. 31, 2018
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, 2018

 

 

September 30, 2018

 

 

 

Carrying

 

 

Fair

 

 

Carrying

 

 

Fair

 

 

 

Value

 

 

Value

 

 

Value

 

 

Value

 

Long-term debt, including current maturities(1)

 

$

891.7

 

 

$

889.2

 

 

$

930.2

 

 

$

926.2

 

 

(1) 

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