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Debt - Schedule of Debt (Tables)
3 Months Ended
Dec. 31, 2024
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The Company's notes payable at their carrying amounts consist of the following:
 December 31, 2024September 30, 2024
 (In millions)
Unsecured:
Revolving credit facility$100.0 $— 
3.85% senior notes due 2026 (1)
398.6 398.4 
5.0% senior notes due 2028 (1)
298.3 298.1 
Other note payable9.9 9.9 
$806.8 $706.4 
______________
(1)Unamortized debt issuance costs that were deducted from the carrying amounts of the senior notes totaled $3.1 million and $3.5 million at December 31, 2024 and September 30, 2024, respectively.