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Fair Value Measurement - Schedule of Fair Values of Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Assets:    
Investment in equity securities [1] $ 20.6  
Foreign currency exchange derivatives [2] 2.6  
Liabilities:    
Foreign currency exchange derivatives [2] 1.7 $ 2.5
SERP Plan [Member]    
Assets:    
SERP plan assets [3] 21.3 21.4
Level 1    
Assets:    
Investment in equity securities [1] 20.6  
Level 1 | SERP Plan [Member]    
Assets:    
SERP plan assets [3] 21.3 21.4
Level 2    
Assets:    
Foreign currency exchange derivatives [2] 2.6  
Liabilities:    
Foreign currency exchange derivatives [2] $ 1.7 $ 2.5
[1] Represents investments in equity securities for which quoted prices in active markets are available. The Company records changes in the fair value of investments in “Miscellaneous, net” in the Consolidated Statements of Income.
[2] Based on observable market transactions of forward currency prices.
[3] Represents investments in a rabbi trust for the Company’s non-qualified SERP. The fair values of these investments are determined using a market approach. Investments include mutual funds for which quoted prices in active markets are available. The Company records changes in the fair value of investments in “Miscellaneous, net” in the Consolidated Statements of Income.