Annual report pursuant to Section 13 and 15(d)

Description of Business and Summary of Significant Accounting Policies - Summary of Significant Accounting Policies (Details)

v3.7.0.1
Description of Business and Summary of Significant Accounting Policies - Summary of Significant Accounting Policies (Details)
$ in Millions
 12 Months Ended
Jun. 30, 2017
USD ($)
Installment
customer
Revenue_source
Jun. 30, 2016
USD ($)
customer
Jun. 30, 2015
USD ($)
customer
Summary of Significant Accounting Policies      
Number of customers with significant revenue | customer 2 2 3
Number of customers with significant A/R | customer 2 2  
Standard warranty coverage (in hours per week) 40 hours    
Standard warranty coverage period (in months) 12 months    
Number of revenue sources | Revenue_source 3    
Non-qualified deferred compensation plan payout period (in years) 15 years    
Employee services share-based compensation, tax benefit realized $ 6.6    
Selling, general and administrative      
Summary of Significant Accounting Policies      
Executive deferred compensation program, compensation expense 20.9 $ (0.8) $ 10.4
Gain (loss), net on deferred compensation plan assets 20.8 0.1 10.4
Cash Long-Term Incentive Plan      
Summary of Significant Accounting Policies      
Executive deferred compensation program, compensation expense $ 48.8 $ 44.6 $ 39.6
Minimum | Cash Long-Term Incentive Plan      
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 33.33333%    
Cash long-term incentive plan, vesting period 3 years    
Maximum | Cash Long-Term Incentive Plan      
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