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Warranty (Tables)
9 Months Ended
Apr. 30, 2020
Standard Product Warranty Disclosure [Abstract]  
Reconciliation of warranty reserves The following is a reconciliation of warranty reserves for the nine months ended April 30, 2020 and 2019 (in millions):
 Nine Months Ended
April 30,
 20202019
Balance at beginning of period$11.2  $18.9  
Accruals for warranties issued during the reporting period2.0  1.6  
Accruals related to pre-existing warranties (including changes in estimates)(0.9) (2.0) 
Less: settlements made during the period(2.5) (6.9) 
Balance at end of period$9.8  $11.6