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Financing Agreements (Tables)
 6 Months Ended
Mar. 31, 2020
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:
 March 31,
2020		September 30, 2019
Senior unsecured 5.00% notes due on February 14, 2025$303.1  $312.4  
Senior unsecured 4.375% notes due on September 15, 2027419.1  435.4  
Unsecured debentures44.8  48.1  
Total$767.0  $795.9  
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.