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Warranty (Tables)
 12 Months Ended
Jul. 31, 2017
Standard Product Warranty Disclosure [Abstract]  
Schedule of product warranty liability
The following is a reconciliation of warranty reserves for the years ended July 31, 2017 and 2016 (in millions):
 
 
Year Ended July 31,
 
 
2017

 
2016

Balance at beginning of period
 
$
11.9

 
$
8.6

Accruals for warranties issued during the reporting period
 
4.7

 
4.6

Accruals related to pre-existing warranties (including changes in estimates)
 
3.6

 
2.9

Less settlements made during the period
 
(5.6
)
 
(4.2
)
Balance at end of period
 
$
14.6

 
$
11.9