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Share-based Compensation - RSU and PSU Activity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
RSUs    
RSUs and PSUs    
Beginning of year (in shares) 13,500,000 4,500,000
Granted (in shares) 4,200,000 3,900,000
Exercised/Vested (in share) (1,800,000) (700,000)
Forfeited/Unexercised (in shares) (400,000) (100,000)
End of year (in shares) 15,500,000 7,600,000
Total remaining unamortized compensation costs $ 121.0 $ 89.4
Weighted average remaining service period (in years) 1 year 2 months 23 days 1 year 4 months 24 days
PSUs    
RSUs and PSUs    
Beginning of year (in shares) 2,100,000 1,400,000
Granted (in shares) 1,200,000 900,000
Exercised/Vested (in share) 0 0
Forfeited/Unexercised (in shares) (500,000) 0
End of year (in shares) 2,800,000 2,300,000
Total remaining unamortized compensation costs $ 42.0 $ 11.6
Weighted average remaining service period (in years) 2 years 4 months 24 days 1 year 10 months 24 days