Leases - Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating lease cost	$ 32.2	$ 32.1	$ 66.2	$ 67.8
Short-term lease cost	0.4	0.4	0.9	0.7
Variable lease cost	4.8	3.9	8.0	6.8
Total operating lease cost	$ 37.4	$ 36.4	$ 75.1	$ 75.3