Property, Plant and Equipment - Property, Plant and Equipment (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
System Components [Member]
Property, plant and equipment
Assets leased to customers under operating lease, Gross	$ 1.4	$ 1.6
Accumulated Depreciation, assets leased to customers under operating lease	1.2	1.2
Assets under joint revenue sharing arrangements included in Theater system components	317.8	323.7
Accumulated Depreciation , Assets under joint revenue sharing arrangements included in Theater system components	181.2	177.9
Theater system components written off in Costs and expenses	0.8	1.0	$ 0.4
Asset under Construction [Member]
Property, plant and equipment
Assets under joint revenue sharing arrangements included in Assets under construction	16.4	9.1
Office and Production Equipment [Member]
Property, plant and equipment
Fully amortized office and production equipment written off in the period	$ 2.4	$ 3.5