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Warranties - Schedule of Changes in Warranty Liability (Detail) - USD ($)
$ in Millions
6 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Guarantees [Abstract]    
Balance at beginning of period $ 22.6 $ 30.8
Warranty provisions 14.8 9.2
Settlements made (14.0) (14.9)
Warranties for current year acquisition 10.2  
Divestiture adjustments (0.6)  
Changes in liability of pre-existing warranties (0.6) (0.6)
Balance at end of period $ 32.4 $ 24.5