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Stock-Based Compensation - Stock Option Activity (Details) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Option Shares      
Outstanding at beginning of year (shares) 2.0 2.3 2.4
Granted (shares) 0.2 0.3 0.2
Exercised (shares) (0.8) (0.6) (0.3)
Canceled or expired (shares) 0.0 0.0 0.0
Outstanding at end of year (shares) 1.4 2.0 2.3
Exercisable at end of year (shares) 1.0 1.5 1.9
Weighted Average Exercise Price      
Outstanding at beginning of year (usd per share) $ 17.52 $ 13.87 $ 12.51
Granted (usd per share) 42.84 27.82 27.29
Exercised (usd per share) 12.12 7.85 13.12
Canceled or expired (usd per share) 30.76 26.44 21.99
Outstanding at end of year (usd per share) 23.58 17.52 13.87
Exercisable at end of year (usd per share) $ 19.15 $ 14.37 $ 11.28