Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Jun. 30, 2022
Accrued Liabilities, Current [Abstract]
Accrued compensation and benefits	$ 42.5	$ 53.2
Accrued interest expense	18.7	18.4
Accrued postretirement benefits	14.1	14.1
Contract liabilities	13.8	14.4
Current portion of lease liabilities	9.6	9.9
Accrued taxes	4.9	6.3
Accrued pension liabilities	3.4	3.4
Derivative financial instruments	2.8	0.3
Accrued income taxes	0.4	0.4
Other	14.2	13.1
Total accrued liabilities	$ 124.4	$ 133.5