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Accrued Expenses and Other Current Liabilities, and Deferred Income Taxes and Other Long-Term Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020
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Accrued Expenses and Other Current Liabilities, and Deferred Income Taxes and Other Long-Term Liabilities [Abstract] |  |  |
Compensation and related benefit costs | $ 34.0 | $ 38.9 | $ 30.3
Customer deposits | 8.8 | 8.1 | 3.1
Accrued commissions | 0.9 | 1.1 | 3.7
Accrued warranty costs | 5.9 | 6.3 | 5.5
Non-income taxes payable | 7.5 | 5.0 | 4.9
Pension and other post-retirement obligations | 0.3 | 0.5 | 0.3
Income taxes payable | 3.2 | 3.1 | 9.2
Restructuring | 1.4 | 3.1 | 0.0
Accrued professional fees related to becoming a public company | 1.8 | 8.3 | 0.0
Deferred and contingent consideration | 2.0 | 0.0 | 0.0
Other accrued expenses | 9.6 | 9.9 | 7.1
Total accrued expenses and other current liabilities | $ 75.4 | $ 84.3 | $ 64.1

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