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Revenue and Contracts with Customers (Revenue from External Customers by Geographic Areas) (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        
Revenue   38.6 139.5 77.8
Product [Member]        
Revenue   269.0 235.6 186.1
Product [Member] | United States        
Revenue   230.4 96.1 108.3
Product [Member] | Belgium        
Revenue   0.1 38.3 36.6
Product [Member] | Japan        
Revenue   23.6 61.6 34.6
Product [Member] | Other Foreign        
Revenue   14.9 39.6 6.6
Product [Member] | Foreign        
Revenue   $ 38.6 $ 139.5 $ 77.8