Discontinued Operations and Dispositions (Narrative) (Details) - USD ($) $ in Millions					1 Months Ended							3 Months Ended				12 Months Ended
	Oct. 03, 2019	Dec. 21, 2018	Oct. 31, 2018	Jul. 01, 2017	Jun. 30, 2021	Jan. 31, 2021	Feb. 29, 2020	Jan. 31, 2020	Oct. 31, 2019	May 31, 2019	Sep. 30, 2018	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business																$ 0.0	$ 0.0	$ 90.0
Total revenues																2,977.4	2,848.6	3,188.5
Share-based compensation benefit																3.8	3.2	4.9
Share-based compensation expense																17.5	13.9	22.9
Royalty-free licensing agreement, term						30 years
Net gain on disposition of assets																98.6	13.4	10.2
Proceeds from disposition of assets, net of cash sold																64.3	78.3	349.1
Outsourcing Agreement | Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues																$ 2.3	7.6	4.8
Outsourcing Agreement | Selling, general and administrative expenses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
OA term																1 year
Transition Services Agreement | Selling, general and administrative expenses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues																$ 0.1	10.9	18.9
Discontinued operations, disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal																	12.3	2.1
Share-based compensation benefit																	$ 0.8
Share-based compensation expense																		$ 0.5
Discontinued operations, disposed of by sale | Time, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business			$ 190.0
Discontinued operations, disposed of by sale | Fortune
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business		$ 150.0
Gain on disposal		$ 2.1
Discontinued operations, disposed of by sale | Sports Illustrated
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business										$ 90.0
Non-cash impairment charge														$ 4.2	$ 8.5
Working capital true-up	$ 0.7
Amount owing for accounts receivable and accounts payable	7.6
Earn-out provision	$ 20.0
Discontinued operations, disposed of by sale | Viant
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business									$ 25.0
Gain on disposal													$ 3.0
Discontinued operations, disposed of by sale | FanSided
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business								$ 16.4
Non-cash impairment charge													$ 11.8
Discontinued operations, disposed of by sale | Xumo
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business							$ 37.4
Gain on disposal												$ 8.6
Proceeds from collection of notes receivable																$ 4.3
Disposal group, disposed of by sale, not discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business									24.9
Net gain on disposition of assets									$ 8.3
Disposal group, disposed of by sale, not discontinued operations | Travel And Leisure Trademark
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business						$ 100.0
Cash						35.0
Note receivable						65.0
Proceeds received from notes receivable					$ 20.0
Discount on notes receivable obtained in disposition						3.7
Net gain on disposition of assets						$ 97.6
Disposal group, disposed of by sale, not discontinued operations | Charleston Tennis LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from collection of notes receivable											$ 8.2
Cash											$ 13.3
Ownership percentage interest				70.00%
Ownership percentage retained											30.00%
Proceeds from disposition of assets, net of cash sold											$ 5.1
Disposal group, disposed of by sale, not discontinued operations | Charleston Tennis LLC | Selling, general and administrative expenses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on disposition of assets											10.4
Disposal group, disposed of by sale, not discontinued operations | Charleston Tennis LLC | Nonoperating income (expense)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on equity method investment											$ 4.1