Nature of Business and Summary of Significant Accounting Policies - Schedule of Other Current Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2021
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Prepaid insurance	$ 3.2	$ 5.3	$ 0.8
Short-term marketable securities	4.3	4.9	4.6
Income tax receivable and prepaid income taxes	2.8	3.9	4.8
Other tax receivables	1.6	2.1	1.2
Other current assets	21.7	15.3	16.9
Prepaid expenses and other current assets	$ 33.6	$ 31.5	$ 28.3