Schedule II-Valuation and Qualifying Accounts [Schedule] (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Allowance for doubtful accounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 2.6	$ 2.7	$ 3.7
Additions charged to costs and expenses	9.6	1.1	1.4
Deductions	(2.4)	(1.2)	(2.4)
Balance at end of period	9.8	2.6	2.7
Deferred tax valuation allowance
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	3.3	3.8	9.3
Additions charged to costs and expenses	3.4	0.0	0.0
Deductions	0.0	(0.4)	(5.5)
Balance at end of period	6.7	3.3	$ 3.8
Other receivables
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	0.0
Additions charged to costs and expenses	1.0
Deductions	0.0
Balance at end of period	$ 1.0	$ 0.0