Financing Agreements (Tables)

3 Months Ended

Dec. 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:

	December 31, 2020		September 30, 2020
Senior unsecured 5.00% notes due on February 15, 2025	$	309.3	$	310.1
Senior unsecured 4.375% notes due on September 15, 2027	450.0		441.2
Unsecured debentures	47.9		48.0
Total	$	807.2	$	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.