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9. Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Effective tax rate 24.20% 21.00% 23.20% 22.90%  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 5.4   $ 5.4    
Unrecognized Tax Benefits $ 75.2   $ 75.2   $ 61.9