Segment Reporting - Other Supplemental Information by Segments Total Assets and Other Supplemental Information by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2025	Sep. 29, 2024	Sep. 28, 2025	Sep. 29, 2024	Dec. 29, 2024
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	$ 5,521.8	$ 7,229.9	$ 5,521.8	$ 7,229.9	$ 6,340.3
Depreciation and intangible asset amortization	40.8	41.5	107.1	125.2
Additions to property, plant and equipment	19.7	18.4	49.6	67.9
Operating Segments | Wizards of the Coast and Digital Gaming
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	7,394.2	5,479.9	7,394.2	5,479.9	5,778.4
Depreciation and intangible asset amortization	4.7	4.5	13.6	13.1
Additions to property, plant and equipment	3.3	2.1	10.4	17.1
Operating Segments | Consumer Products
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	9,100.8	7,558.8	9,100.8	7,558.8	7,785.2
Depreciation and intangible asset amortization	29.6	31.6	72.6	81.8
Additions to property, plant and equipment	14.2	13.8	36.5	38.4
Operating Segments | Entertainment
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	1,429.9	2,884.7	1,429.9	2,884.7	2,857.8
Depreciation and intangible asset amortization	5.2	4.1	15.5	12.5
Additions to property, plant and equipment	0.1	0.0	0.1	0.0
Corporate and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	(12,403.1)	(8,693.5)	(12,403.1)	(8,693.5)	$ (10,081.1)
Depreciation and intangible asset amortization	1.3	1.3	5.4	17.8
Additions to property, plant and equipment	$ 2.1	$ 2.5	$ 2.6	$ 12.4