Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Deferred tax assets
Accounts receivable allowances and return reserves	$ 25.0	$ 29.7
Compensation and benefits	0.0	0.7
Indirect benefit of uncertain state and foreign tax positions	5.8	6.3
Investment in partnerships	1.0	6.8
Tax loss carryforwards	47.4	43.3
Lease liabilities	117.3	126.5
All other assets	14.2	17.7
Total deferred tax assets	210.7	231.0
Valuation allowance	(17.5)	(17.2)
Net deferred tax assets	193.2	213.8
Deferred tax liabilities
Subscription acquisition costs	55.1	62.0
Compensation and benefits	7.4	0.0
Accumulated depreciation and amortization	482.8	494.3
Deferred gains from dispositions	15.0	15.8
Lease right-of-use assets	92.6	101.6
All other liabilities	2.7	3.7
Total deferred tax liabilities	655.6	677.4
Net deferred tax liability	$ 462.4	$ 463.6