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Contracts in Progress - Schedule of Costs in Excess of Billings and Billings in Excess of Costs on Uncompleted Contracts (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020
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Revenue from Contract with Customer [Abstract] |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts – current | $ 56.3 | $ 57.2 | $ 59.5
Costs and estimated earnings in excess of billings on uncompleted contracts – noncurrent | 6.5 | 8.1 | 0.0
Billings in excess of costs and estimated earnings on uncompleted contracts – current | (17.6) | (8.0) | (8.0)
Billings in excess of costs and estimated earnings on uncompleted contracts – noncurrent | (2.1) | (2.9) | 0.0
Costs in excess of billings, current and noncurrent | $ 43.1 | $ 54.4 | $ 51.5

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