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Warranties - Schedule of Changes in Warranty Liability (Detail) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Guarantees [Abstract]    
Balance at beginning of year $ 40.2 $ 38.8
Warranty provisions 24.1 29.5
Settlements made (32.0) (34.0)
Warranties for current year acquisitions 1.4 6.7
Changes in liability of pre-existing warranties (2.9) (0.8)
Balance at end of year $ 30.8 $ 40.2