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Stock-Based Compensation Plans - Restricted Stock Unit Awards (Details) - Restricted Stock Units
shares in Thousands
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Shares [Roll Forward]  
Balance at beginning of period (in shares) | shares 5,546
Granted (in shares) | shares 326
Vested (in shares) | shares (711)
Forfeited (in shares) | shares (532)
Balance at end of period (in shares) | shares 4,629
Weighted-Average Grant-Date Fair Value [Abstract]  
Balance at beginning of period (in usd per share) | $ / shares $ 33.09
Granted (in usd per share) | $ / shares 45.58
Vested (in usd per share) | $ / shares 30.30
Forfeited (in usd per share) | $ / shares 34.15
Balance at end of period (in usd per share) | $ / shares $ 34.28