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Share-based Compensation - Option Activity (Details) - Stock Options - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Number of Options    
Outstanding at beginning of year (in shares) 3,700,000 4,800,000
Granted (in shares) 0 0
Exercised/Vested (in share) 0 (200,000)
Forfeited/Unexercised (in shares) 0 (100,000)
Outstanding at end of year (in shares) 3,700,000 4,500,000
Aggregate Intrinsic Value    
Total remaining unamortized compensation costs $ 0.0 $ 0.0
Weighted average remaining service period (in years) 0 years 0 years