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Financing Agreements (Tables)
 9 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Fair Values of Long-Term Debt Instruments The estimated fair values of our long-term debt instruments are described in the table below:
 June 30,
2021		September 30, 2020
Senior unsecured 5.00% notes due on February 15, 2025
$— $310.1 
Senior unsecured 4.375% notes due on September 15, 2027
443.3 441.2 
Unsecured debentures47.2 48.0 
Total$490.5 $799.3 
The estimated fair values of our long-term unsecured debentures were based on observable inputs such as quoted prices in markets that are not active. The estimated fair values of the Senior Notes were based on quoted prices for similar liabilities. These fair value measurements were classified as Level 2.