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Goodwill - Narrative (Details) $ in Millions			3 Months Ended		6 Months Ended
Goodwill - Narrative (Details) $ in Millions	May 19, 2022 USD ($)	Jun. 29, 2021 USD ($)	Jun. 27, 2021 USD ($)	Mar. 28, 2021 segment	Jun. 27, 2021 USD ($)	Jun. 26, 2022 USD ($)	Dec. 26, 2021 USD ($)	Dec. 27, 2020 USD ($)
Goodwill [Line Items]
Number of reportable segments \| segment				3
Goodwill			$ 3,420.8		$ 3,420.8	$ 3,483.2	$ 3,419.6	$ 3,691.7
Impairment during the period					101.8
Goodwill and intangible assets written off related to sale of business					169.2
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| eOne Music
Goodwill [Line Items]
Impairment during the period		$ 101.8	101.8
Wizards of the Coast and Digital Gaming
Goodwill [Line Items]
Goodwill			$ 307.7		307.7	371.9	$ 307.3	$ 53.1
Impairment during the period					0.0
Goodwill and intangible assets written off related to sale of business					$ 0.0
D&D Beyond
Goodwill [Line Items]
Aggregate purchase price	$ 146.3
Goodwill						$ 64.7
D&D Beyond \| Wizards of the Coast and Digital Gaming
Goodwill [Line Items]
Goodwill	$ 64.7