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Supplemental Operations and Cash Flow Information (Tables)
12 Months Ended
Sep. 30, 2021
Supplemental Cash Flow Elements [Abstract]  
Supplemental Operations Statement and Cash Flow Information
Year Ended September 30,
202120202019
Advertising and promotion expenses$39.1 $33.0 $19.9 
Repair and maintenance expenses0.4 0.6 0.4 
Research and development expenses11.2 9.4 7.6 
Interest paid (a)35.7 48.8 — 
Income taxes paid (b)12.0 10.1 0.3