Program Rights (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Film Disclosure [Line Items]
Program rights write-offs	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Prepaid expenses and other current assets
Film Disclosure [Line Items]
Income tax receivable, program rights			191.7		$ 143.1
Other noncurrent assets
Film Disclosure [Line Items]
Income tax receivable, program rights			$ 84.6		$ 104.5