Fair Value of Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jun. 30, 2019
Cash and cash equivalents:
Money market funds	$ 69.9	$ 68.1
Other current assets:
Securities	0.5	0.4
Other non-current assets:
Securities	95.3	81.8
Total assets as of period end	165.8	150.3
Liabilities:
Contingent consideration obligations	32.7	28.4
Total liabilities as of period end	32.7	28.4
Level 1
Cash and cash equivalents:
Money market funds	69.9	68.1
Other current assets:
Securities	0.5	0.4
Other non-current assets:
Securities	95.3	81.8
Total assets as of period end	165.8	150.3
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	32.7	28.4
Total liabilities as of period end	32.7	28.4
Money Market Deposit Accounts
Cash and cash equivalents:
Money market funds	$ 69.9	$ 30.1