Theatre Assets Held for Sale - Schedule of Theatre Assets Held for Sale (Details) - USD ($) $ in Millions		Jun. 30, 2023	Dec. 31, 2022
Long-Lived Assets Held-for-sale [Line Items]
Goodwill	[1]	$ 1,255.9	$ 1,250.9
Theatre Assets Held for Sale [Member]
Long-Lived Assets Held-for-sale [Line Items]
Theatre property and equipment, net		5.5	5.4
Operating lease right-of-use assets, net		3.4	2.9
Goodwill		4.2	4.2
Total assets		17.1	15.3
Total liabilities		$ 8.9	$ 8.5

[1] Balances are presented net of accumulated impairment losses of $214.0 for the U.S. operating segment and $43.8 for the international operating segment. See discussion of the qualitative impairment analysis performed by the Company as of June 30, 2023 at Note 12.