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9. Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Effective tax rate 18.70% 22.90%  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 17.6    
Unrecognized Tax Benefits $ 87.2   $ 85.5