Fair Value of Financial Instruments - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2023	Jun. 30, 2023
Other current assets:
Securities	$ 0.7	$ 0.7
Other non-current assets:
Securities	158.4	141.3
Derivative asset	$ 34.8	$ 66.7
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	Other current assets	Other current assets
Total assets	$ 193.9	$ 208.7
Liabilities:
Contingent consideration obligations	7.6	12.0
Total liabilities as of period end	7.6	12.0
Level 1
Other current assets:
Securities	0.7	0.7
Other non-current assets:
Securities	158.4	141.3
Derivative asset	0.0	0.0
Total assets	159.1	142.0
Liabilities:
Contingent consideration obligations	0.0	0.0
Total liabilities as of period end	0.0	0.0
Level 2
Other current assets:
Securities	0.0	0.0
Other non-current assets:
Securities	0.0	0.0
Derivative asset	34.8	66.7
Total assets	34.8	66.7
Liabilities:
Contingent consideration obligations	0.0	0.0
Total liabilities as of period end	0.0	0.0
Level 3
Other current assets:
Securities	0.0	0.0
Other non-current assets:
Securities	0.0	0.0
Derivative asset	0.0	0.0
Total assets	0.0	0.0
Liabilities:
Contingent consideration obligations	7.6	12.0
Total liabilities as of period end	$ 7.6	$ 12.0