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Description of Business and Summary of Significant Accounting Policies - Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended
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Jun. 30, 2018 USD ($) Installment customer Revenue_source | Jun. 30, 2017 USD ($) customer | Jun. 30, 2016 USD ($) customer
Summary of Significant Accounting Policies |  |  |
Number of customers with significant revenue | customer | 1 | 2 | 2
Number of customers with significant A/R | customer | 3 | 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 | 15 years |  |
Selling, general and administrative |  |  |
Summary of Significant Accounting Policies |  |  |
Executive deferred compensation program, compensation expense (benefit) | $ 19.9 | $ 20.9 | $ (0.8)
Gain (loss), net on deferred compensation plan assets | 19.5 | 20.8 | 0.1
Cash Long-Term Incentive Plan |  |  |
Summary of Significant Accounting Policies |  |  |
Executive deferred compensation program, compensation expense (benefit) | $ 52.4 | $ 48.8 | $ 44.6
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 |  |

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