Annual report pursuant to Section 13 and 15(d)

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

v3.5.0.2
Description of Business and Summary of Significant Accounting Policies - Summary of Significant Accounting Policies (Details)
$ in Millions
 12 Months Ended
Jun. 30, 2016
USD ($)
Installment
customer
Revenue_source
Jun. 30, 2015
USD ($)
customer
Jun. 30, 2014
USD ($)
customer
Summary of Significant Accounting Policies      
Number of customers with significant revenue | customer 2 3 3
Number of customers with significant accounts receivable balance | customer 2 1  
Standard warranty coverage, hours per week 40 hours    
Standard warranty coverage 12 months    
Number of revenue sources | Revenue_source 3    
Non-qualified deferred compensation plan payout period (in years) 15 years    
Early adoption effect      
Summary of Significant Accounting Policies      
Net current deferred tax assets $ 218.0    
Selling, general and administrative      
Summary of Significant Accounting Policies      
Executive deferred compensation program, compensation expense (0.8) $ 10.4 $ 24.4
Gain (loss), net on deferred compensation plan assets $ 0.1 10.4 24.8
Cash Long-Term Incentive Plan      
Summary of Significant Accounting Policies      
Cash long-term incentive plan, number of 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    
Executive deferred compensation program, compensation expense $ 44.6 $ 39.6 $ 26.2
Total Revenue      
Summary of Significant Accounting Policies      
Concentration risk, percentage 10.00% 10.00% 10.00%
Accounts Receivable      
Summary of Significant Accounting Policies      
Concentration risk, percentage 10.00% 10.00%