Equity Method Investment (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2009	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023	Sep. 23, 2014
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments		$ 0.0	$ (78.2)	$ 0.0
Discovery Family Channel
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership (as a percent)	50.00%				40.00%
Payments to acquire interest in joint venture	$ 300.0
Impairment loss		80.0	1.3
Equity method investments		0.0	5.6
Discovery Family Channel | Other Expense
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments		1.8	9.4	10.9
Discovery Family Channel | Warner Bros. Discovery
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership interest (as a percent)					60.00%
Warner Bros. Discovery
Schedule of Equity Method Investments [Line Items]
Payments made under tax sharing agreement		2.8	6.7	$ 5.7
Warner Bros. Discovery | Other liabilities
Schedule of Equity Method Investments [Line Items]
Remaining present value of expected future payments		$ 0.3	$ 3.0