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Other Income, Net
6 Months Ended
Mar. 31, 2021
Other Nonoperating Income (Expense) [Abstract]  
Other Income, Net Other Income, Net
Three Months Ended
March 31,
Six Months Ended
March 31,
 2021202020212020
Interest income $1.0 $0.6 $1.6 $1.9 
Foreign currency exchange gain, net$— $1.8 $0.4 $1.9 
Other, net$— $(0.1)$(1.4)$0.4 
Other income, net$1.0 $2.3 $0.6 $4.2