Schedule II-Valuation and Qualifying Accounts [Schedule] (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 9.3	$ 9.8	$ 2.6
Charged to costs and expenses	0.0	1.1	9.6
Charged to other accounts	0.0	0.0	0.0
Deductions	(2.5)	(1.6)	(2.4)
Balance at end of period	6.8	9.3	9.8
Deferred tax valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	10.5	6.7	3.3
Charged to costs and expenses	0.0	1.0	3.4
Charged to other accounts	0.2	2.7	0.0
Deductions	0.0	0.0	0.0
Balance at end of period	10.7	10.5	6.7
Other receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	1.0	1.0	0.0
Charged to costs and expenses	0.7	0.0	1.0
Charged to other accounts	0.0	0.0	0.0
Deductions	0.0	0.0	0.0
Balance at end of period	$ 1.7	$ 1.0	$ 1.0