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Income Taxes - Gross Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Unrecognized tax benefits at beginning of year $ 0.1 $ 0.1
Reductions for tax positions of prior years (0.1) 0.0
Unrecognized tax benefits at end of year $ 0.0 $ 0.1