Fair Value of Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020
Cash and cash equivalents:
Money market funds	$ 120.0	$ 150.1
Other current assets:
Securities	0.4	0.5
Other non-current assets:
Securities	108.5	102.0
Total assets as of period end	229.0	252.7
Liabilities:
Contingent consideration obligations	23.7	33.1
Total liabilities as of period end	23.7	33.1
Level 1
Cash and cash equivalents:
Money market funds	120.0	150.1
Other current assets:
Securities	0.4	0.5
Other non-current assets:
Securities	108.5	102.0
Total assets as of period end	229.0	252.7
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	23.7	33.1
Total liabilities as of period end	23.7	33.1
Money Market Deposit Accounts
Cash and cash equivalents:
Money market funds	$ 120.0	$ 150.1