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Share-Based Compensation - RSU Activity (Details) - $ / shares
shares in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Restricted Stock Unit Activity Under 2011 Plan    
Shares    
Nonvested at beginning of year (in shares) 0.9  
Granted (in shares) 0.0  
Vested (in shares) (0.6)  
Forfeited (in shares) 0.0  
Nonvested at end of year (in shares) 0.3 0.9
Weighted Average Grant Date Fair Value    
Nonvested at beginning of year (in dollars per share) $ 17.72  
Granted (in dollars per share) 0 $ 0
Vested (in dollars per share) 17.70  
Forfeited (in dollars per share) 18.05  
Nonvested at end of year (in dollars per share) $ 18.17 $ 17.72
Restricted Stock Unit Activity Under 2020 Plan    
Shares    
Nonvested at beginning of year (in shares) 1.3  
Granted (in shares) 2.2  
Vested (in shares) (0.5)  
Forfeited (in shares) (0.2)  
Nonvested at end of year (in shares) 2.8 1.3
Weighted Average Grant Date Fair Value    
Nonvested at beginning of year (in dollars per share) $ 17.98  
Granted (in dollars per share) 12.56  
Vested (in dollars per share) 18.43  
Forfeited (in dollars per share) 16.32  
Nonvested at end of year (in dollars per share) $ 13.97 $ 17.98