Annual report pursuant to Section 13 and 15(d)

DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Significant Accounting Policies (Details)

v3.20.2
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Significant Accounting Policies (Details)
$ in Millions
 12 Months Ended
Jun. 30, 2020
USD ($)
Installment
Jun. 30, 2019
USD ($)
Installment
Jun. 30, 2018
USD ($)
Installment
Summary of Significant Accounting Policies      
Number of customers with significant revenue | Installment 2 1 1
Standard warranty coverage period 12 months    
Non-qualified deferred compensation plan payout period 15 years    
Minimum      
Summary of Significant Accounting Policies      
Standard warranty coverage period 6 months    
Maximum      
Summary of Significant Accounting Policies      
Standard warranty coverage period 12 months    
Selling, general and administrative      
Summary of Significant Accounting Policies      
Executive deferred compensation program, compensation expense (benefit) | $ $ 13.3 $ 13.6 $ 19.9
Gain (loss), net on deferred compensation plan assets | $ 13.9 14.7 19.5
Cash Long-Term Incentive Plan      
Summary of Significant Accounting Policies      
Executive deferred compensation program, compensation expense (benefit) | $ $ 64.0 $ 55.5 $ 52.4
Cash Long-Term Incentive Plan | Minimum      
Summary of Significant Accounting Policies      
Cash long-term incentive plan, equal vesting installments | Installment 3    
Cash long-term incentive plan, percentage of equal vesting installments 33.33%    
Cash long-term incentive plan, vesting period 3 years    
Cash Long-Term Incentive Plan | Maximum      
Summary of Significant Accounting Policies      
Cash long-term incentive plan, equal vesting installments | Installment 4    
Cash long-term incentive plan, percentage of equal vesting installments 25.00%    
Cash long-term incentive plan, vesting period 4 years