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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Unrecognized tax benefits [Roll Forward]    
Balance as of beginning of period $ 4.5 $ 39.0
Additions for tax positions of prior years 0.2  
Expiration of statutes of limitations (2.6) (0.2)
Reduction for tax positions of prior years   (0.3)
Settlements of uncertain tax positions with tax authorities   (34.0)
Balance as of end of period $ 2.1 $ 4.5