Leases - ROU Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024
Operating lease assets:
Other assets	$ 35.4	$ 39.0
Operating lease liabilities:
Accrued liabilities	8.0	8.8
Other liabilities	34.9	38.4
Total operating lease liabilities	$ 42.9	$ 47.2
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Accrued liabilities	Accrued liabilities
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Liabilities	Liabilities