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Revenue and Contracts with Customers (Revenue from External Customers by Geographic Areas) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenue $ 43.7 $ 66.9
Product [Member]    
Revenue 23.6 58.8
Product [Member] | United States    
Revenue 23.6 58.7
Product [Member] | Other Foreign    
Revenue $ 0.0 $ 0.1