Fair Value of Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2021	Jun. 30, 2021
Cash and cash equivalents:
Money market funds	$ 0.0	$ 0.0
Other current assets:
Securities	0.7	0.7
Other non-current assets:
Securities	132.9	120.6
Total assets as of period end	133.6	121.2
Liabilities:
Contingent consideration obligations	18.8	23.2
Total liabilities as of period end	18.8	23.2
Level 1
Cash and cash equivalents:
Money market funds	0.0	0.0
Other current assets:
Securities	0.7	0.7
Other non-current assets:
Securities	132.9	120.6
Total assets as of period end	133.6	121.2
Liabilities:
Contingent consideration obligations	0.0	0.0
Total liabilities as of period end	0.0	0.0
Level 2
Cash and cash equivalents:
Money market funds	0.0	0.0
Other current assets:
Securities	0.0	0.0
Other non-current assets:
Securities	0.0	0.0
Total assets as of period end	0.0	0.0
Liabilities:
Contingent consideration obligations	0.0	0.0
Total liabilities as of period end	0.0	0.0
Level 3
Cash and cash equivalents:
Money market funds	0.0	0.0
Other current assets:
Securities	0.0	0.0
Other non-current assets:
Securities	0.0	0.0
Total assets as of period end	0.0	0.0
Liabilities:
Contingent consideration obligations	18.8	23.2
Total liabilities as of period end	18.8	23.2
Money Market Deposit Accounts
Cash and cash equivalents:
Money market funds	$ 0.1	$ 0.1