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Revenue Recognition (Comparison Of Geographic Revenues) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Total revenues $ 1,493.1 $ 1,424.9 $ 1,327.6
U.S. [Member]      
Disaggregation of Revenue [Line Items]      
Total revenues 994.7 937.6 851.3
EMEA [Member]      
Disaggregation of Revenue [Line Items]      
Total revenues 228.2 226.0 231.7
CHINA      
Disaggregation of Revenue [Line Items]      
Total revenues 91.6 106.0 101.7
Other [Member]      
Disaggregation of Revenue [Line Items]      
Total revenues $ 178.6 $ 155.3 $ 142.9