Goodwill and Other Intangible Assets, Net - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024
Other intangible assets
Gross Carrying Amount	$ 100.7	$ 100.7
Accumulated Amortization	(91.2)	(85.5)
Net  Carrying Amount	$ 9.5	15.2
Trademarks and trade names
Other intangible assets
Useful Life (in Years)	30 years
Gross Carrying Amount	$ 29.9	29.9
Accumulated Amortization	(28.2)	(27.3)
Net  Carrying Amount	$ 1.7	2.6
Customer relationships
Other intangible assets
Useful Life (in Years)	15 years
Gross Carrying Amount	$ 70.8	70.8
Accumulated Amortization	(63.0)	(58.2)
Net  Carrying Amount	$ 7.8	$ 12.6