Investments in Productions and Investments in Acquired Content Rights - Program Costs Amortization (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Product Information [Line Items]
Program cost amortization	$ 187.9	$ 85.4	$ 396.1	$ 268.2
eOne
Product Information [Line Items]
Program cost amortization			396.1
eOne | Investment in Production
Product Information [Line Items]
Program cost amortization			334.6
eOne | Investment in Content
Product Information [Line Items]
Program cost amortization			59.9
eOne | Other
Product Information [Line Items]
Program cost amortization			$ 1.6