Leases - Summary of Right-of-Use Assets and Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Jun. 30, 2022
Operating lease assets:
Other assets	$ 39.4	$ 42.9
Operating lease liabilities:
Accrued liabilities	9.6	9.9
Other liabilities	39.1	42.7
Total operating lease liabilities	$ 48.7	$ 52.6