Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Effective income tax rate			22.10%	13.30%	8.20%
Income tax benefit		$ 26.9	$ (87.0)	$ 32.2	$ (11.5)
Credit to income tax expense for write-off of worthless stock and related bad debt					$ 23.5
Increase in valuation allowance			0.3
Unrecognized tax benefits that, if recognized, would impact effective tax rate			31.4	40.6
Unrecognized tax benefits, accrued interest and penalties			11.9	13.4
Time, Inc.
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Tax liability recorded in connection with the TMA			29.8	28.9
Minimum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Estimated decrease in unrecognized tax benefits			18.6
Maximum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Estimated decrease in unrecognized tax benefits			2.5
Federal
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax benefit	$ 15.2
Net operating loss carryforwards			6.9
State
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Net operating loss carryforwards			$ 209.9
National Media
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax benefit		26.9
Non-cash impairment charge		$ 252.7		$ 252.7