Investments in Productions and Investments in Acquired Content Rights - Program Production Costs (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 27, 2021	Dec. 27, 2020	Jun. 28, 2020
Film and TV Programming
Released, net of amortization	$ 499.4	$ 428.0	$ 346.8
Completed and not released	17.7	17.3	128.1
In production	220.5	185.5	41.4
Pre-production	73.8	67.6	70.4
Total film costs	811.4	698.4	586.7
Other Programming
Released, net of amortization	3.4	13.7	12.7
Completed and not released	0.4	2.1	2.9
In production	6.3	5.4	7.0
Pre-production	1.7	7.6	5.5
Other programming costs	11.8	28.8	28.1
Total Program Investments	823.2	$ 727.2	$ 614.8
Investments in productions and investments in acquired content rights transferred to Assets Held for Sale	$ 8.0