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Warranties - Schedule of Changes in Warranty Liability (Detail) - USD ($)
$ in Millions
6 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Guarantees [Abstract]    
Balance at beginning of period $ 30.8 $ 40.2
Warranty provisions 9.2 14.0
Settlements made (14.9) (17.5)
Warranties for current year acquisitions   1.4
Changes in liability of pre-existing warranties (0.6) (1.3)
Balance at end of period $ 24.5 $ 36.8