Leases - Right of Use Assets and Operating Lease Liabilities (Details) - USD ($) $ in Millions	6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023
Leases [Abstract]
Cash paid for operating lease liabilities	$ 63.6	$ 65.3
Operating lease ROU assets obtained in exchange for new operating lease liabilities	$ 45.8	$ 18.7
Weighted-average remaining lease term (in years)	5 years		6 years
Weighted-average discount rate	3.00%		2.70%
Current operating lease liability	$ 96.5		$ 95.5