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Revenue by Geographic Area (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenue   $ 320.2 $ 293.8 $ 298.3
United States        
Revenue   281.6 154.3 220.5
Belgium        
Revenue $ 0.1   38.3 36.6
Japan        
Revenue   23.6 61.6 34.6
Other Foreign        
Revenue   14.9 39.6 6.6
Foreign [Member]        
Revenue   $ 38.6 $ 139.5 $ 77.8