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Derivative Financial Instruments and Hedging Activities - Schedule of Fair Values of All Open Derivative Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Other Current Assets    
Fair values of open derivative instruments    
Fair value of derivative assets $ 0.7  
Other Long -term Assets    
Fair values of open derivative instruments    
Fair value of derivative assets 1.9  
Other Current Liabilities    
Fair values of open derivative instruments    
Fair value of derivative liabilities 1.5 $ 2.5
Other Long Term Liabilities    
Fair values of open derivative instruments    
Fair value of derivative liabilities 0.2  
Not Designated as Hedging Instruments | Foreign Exchange Contract | Other Current Assets    
Fair values of open derivative instruments    
Fair value of derivative assets 0.2  
Not Designated as Hedging Instruments | Foreign Exchange Contract | Other Long -term Assets    
Fair values of open derivative instruments    
Fair value of derivative assets 0.1  
Not Designated as Hedging Instruments | Foreign Exchange Contract | Other Current Liabilities    
Fair values of open derivative instruments    
Fair value of derivative liabilities 1.5 2.0
Not Designated as Hedging Instruments | Foreign Exchange Contract | Other Long Term Liabilities    
Fair values of open derivative instruments    
Fair value of derivative liabilities 0.2  
Cash Flow Hedging | Designated as Hedging Instrument | Foreign Exchange Contract | Other Current Assets    
Fair values of open derivative instruments    
Fair value of derivative assets 0.5  
Cash Flow Hedging | Designated as Hedging Instrument | Foreign Exchange Contract | Other Long -term Assets    
Fair values of open derivative instruments    
Fair value of derivative assets $ 1.8  
Cash Flow Hedging | Designated as Hedging Instrument | Foreign Exchange Contract | Other Current Liabilities    
Fair values of open derivative instruments    
Fair value of derivative liabilities   $ 0.5