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Income Taxes - Effective tax rate (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Income Taxes          
U.S. federal statutory income tax rate 21.00% 21.00%   21.00% 21.00%
Effective tax rate 51.10%   25.10% 35.80% 25.90%
Valuation allowance on deferred tax assets $ 1.1     $ 1.1