Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018
Deferred tax assets
Accounts receivable allowances and return reserves	$ 19.3	$ 6.8
Compensation and benefits	29.6	44.0
Indirect benefit of uncertain state and foreign tax positions	6.8	6.4
Investment in foreign subsidiary	0.0	62.1
Investment in partnerships	15.4	8.4
Tax loss carryforwards	57.7	127.8
Accelerated gains from dispositions	18.2	0.0
All other assets	16.9	8.8
Total deferred tax assets	163.9	264.3
Valuation allowance	(21.7)	(21.1)
Net deferred tax assets	142.2	243.2
Deferred tax liabilities
Subscription acquisition costs	66.9	43.4
Accumulated depreciation and amortization	559.2	612.0
Deferred gains from dispositions	15.8	15.7
All other liabilities	4.9	4.6
Total deferred tax liabilities	646.8	675.7
Net deferred tax liability	$ 504.6	$ 432.5