Segment Reporting - Total Assets by Segments (Details) - USD ($) $ in Millions	Sep. 26, 2021	Dec. 27, 2020	Sep. 27, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 10,230.4	$ 10,818.3	$ 10,703.2
Corporate and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	(1,008.7)	(1,322.9)	(2,746.8)
Consumer Products | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,754.0	5,552.5	6,323.4
Wizards of the Coast and Digital Gaming | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	915.1	585.7	926.9
Entertainment | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 5,570.0	$ 6,003.0	$ 6,199.7