Segment Reporting - Total Assets by Segments (Details) - USD ($) $ in Millions	Mar. 28, 2021	Dec. 27, 2020	Mar. 29, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 10,189.1	$ 10,818.3	$ 10,424.4
Corporate and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	(2,102.3)	(1,322.9)	(1,612.9)
Consumer Products | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	5,567.7	5,552.5	5,098.5
Wizards of the Coast & Digital Gaming | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	616.9	585.7	706.0
Entertainment | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 6,106.8	$ 6,003.0	$ 6,232.8