Income Taxes (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	May 23, 2014	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
U.S. statutory tax rate			21.00%	28.10%	35.00%
Tax cuts and jobs act of 2017, change in tax rate, provisional income tax expense (benefit)				$ 133.0
Excess tax benefit		$ 2.2
Effective income tax rate			8.20%	1282.40%	34.90%
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Capital loss carryforwards			$ 23.5
Increase in valuation allowance		$ 0.6
Unrecognized tax benefits that, if recognized, would impact effective tax rate			44.5	$ 49.7
Unrecognized tax benefits, accrued interest and penalties			12.0	8.4
Time, Inc.
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Tax liability recorded in connection with the TMA			27.5	$ 26.0
Federal
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Net operating loss carryforwards			56.1
State
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Net operating loss carryforwards			161.6
Minimum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Estimated decrease in unrecognized tax benefits			$ 15.3
Maximum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Estimated decrease in unrecognized tax benefits					$ 4.4
Time, Inc.
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Distribution ratio	12.50%