Program Rights (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Film Disclosure [Line Items]
Program rights write-offs	$ 0.0	$ 0.0
Prepaid expenses and other current assets
Film Disclosure [Line Items]
Income tax receivable, program rights	235.9		$ 230.3
Other noncurrent assets
Film Disclosure [Line Items]
Income tax receivable, program rights	$ 45.9		$ 49.9