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Warranty (Tables)
 3 Months Ended
Oct. 31, 2019
Standard Product Warranty Disclosure [Abstract]  
Reconciliation of warranty reserves The following is a reconciliation of warranty reserves for the three months ended October 31, 2019 and 2018 (in millions):
 
Three Months Ended
October 31,
 
2019

 
2018

Balance at beginning of period
$
11.2

 
$
18.9

Accruals for warranties issued during the reporting period
0.4

 
0.3

Accruals related to pre-existing warranties (including changes in estimates)
(0.3
)
 
(0.4
)
Less: settlements made during the period
(1.0
)
 
(1.7
)
Balance at end of period
$
10.3

 
$
17.1