Segment Reporting - Total Assets by Segments (Details) - USD ($) $ in Millions	Jun. 27, 2021	Dec. 27, 2020	Jun. 28, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 10,102.2	$ 10,818.3	$ 10,222.1
Corporate and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	(276.7)	(1,322.9)	(2,168.8)
Consumer Products | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	3,508.7	5,552.5	5,432.1
Wizards of the Coast & Digital Gaming | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	745.8	585.7	790.9
Entertainment | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 6,124.4	$ 6,003.0	$ 6,167.9