Leases - Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Leases [Abstract]
Operating lease cost	$ 29.4	$ 33.5	$ 95.6	$ 101.3
Short-term lease cost	0.3	0.8	1.1	1.5
Variable lease cost	4.7	4.7	12.8	11.5
Total operating lease cost	$ 34.4	$ 39.0	$ 109.5	$ 114.3