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9. Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Effective tax rate 22.90% 24.70%  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 20.6    
Unrecognized Tax Benefits $ 75.1   $ 61.9