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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance as of beginning of year $ 8.4 $ 6.3 $ 4.8
Increases related to prior year tax positions 0.0 0.6 0.3
Decreases related to prior year tax positions (0.2) 0.0 (0.1)
Expiration of statute of limitations 0.0 0.0 (0.1)
Current year increases 1.7 1.5 1.4
Balance as of end of year $ 9.9 $ 8.4 $ 6.3