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Stock Compensation Plans - Options (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Options Outstanding Activity      
Options outstanding, beginning of period (in shares) 5,064,815    
Options granted (in shares) 0    
Options exercised (in shares) (286,414)    
Options expired (in shares) (652,937)    
Options cancelled (in shares) (287,876)    
Options outstanding, end of period (in shares) 3,837,588 5,064,815  
Weighted Average Exercise Price      
Options outstanding, beginning of period (in dollars per share) $ 17.74    
Options granted (in dollars per share) 0    
Options exercised (in dollars per share) 10.12    
Options expired (in dollars per share) 27.82    
Options cancelled (in dollars per share) 25.67    
Options outstanding, end of period (in dollars per share) $ 16 $ 17.74  
Other Options Information      
Options vested and expected to vest (in shares) 3,837,588    
Options exercisable (in shares) 3,837,588    
Options available for grant (in shares) 12,991,397    
Options vested and expected to vest, weighted average exercise price (in dollars per share) $ 16    
Outstanding end of period (in dollars per share) $ 16    
Options outstanding, weighted average remaining contractual term 4 years    
Options vested and expected to vest, weighted average remaining contractual term 4 years    
Options exercisable, weighted average remaining contractual term 4 years    
Options exercised, aggregate intrinsic value $ 0.5 $ 1.0 $ 0.4
Options outstanding, aggregate intrinsic value 0.0    
Options vested and expected to vest, aggregate intrinsic value 0.0    
Options exercisable, aggregate intrinsic value $ 0.0