Fair Value of Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Cash and cash equivalents:
Money market funds	$ 0.0	$ 150.1
Other current assets:
Securities	0.7	0.5
Other non-current assets:
Securities	120.6	102.0
Liabilities:
Contingent consideration obligations	23.2	33.1
Level 1
Cash and cash equivalents:
Money market funds	0.0	150.1
Other current assets:
Securities	0.7	0.5
Other non-current assets:
Securities	120.6	102.0
Liabilities:
Contingent consideration obligations	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
Liabilities:
Contingent consideration obligations	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
Liabilities:
Contingent consideration obligations	23.2	33.1
Fair Value, Measurements, Recurring
Other non-current assets:
Total	121.2	252.7
Liabilities:
Total	23.2	33.1
Fair Value, Measurements, Recurring | Level 1
Other non-current assets:
Total	121.2	252.7
Liabilities:
Total	0.0	0.0
Fair Value, Measurements, Recurring | Level 2
Other non-current assets:
Total	0.0	0.0
Liabilities:
Total	0.0	0.0
Fair Value, Measurements, Recurring | Level 3
Other non-current assets:
Total	0.0	0.0
Liabilities:
Total	$ 23.2	$ 33.1