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Derivative Financial Instruments (Tables)
6 Months Ended
Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative instruments in condensed consolidated balance sheets
Balance Sheet LocationFair ValuePortion Designated as Hedging Instrument
Other liabilities  $3.8  $3.8  
Other noncurrent liabilities  6.8  6.8  
Total other liabilities  $10.6  $10.6