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Stock Based Compensation - Stock Option Plans By Exercise Price Range (Details)
shares in Millions
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options outstanding (in shares) | shares 4.5
Options outstanding, average remaining life 7 years 3 months 18 days
Options vested (in shares) | shares 1.6
$9.92 - $23.46  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price range, minimum (in dollars per share) $ 9.92
Exercise price range, maximum (in dollars per share) $ 23.46
Options outstanding (in shares) | shares 1.5
Options outstanding (in dollars per share) $ 18.23
Options outstanding, average remaining life 5 years
Options vested (in shares) | shares 1.2
Options vested (in dollars per share) $ 17.27
$23.47 - $29.34  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price range, minimum (in dollars per share) 23.47
Exercise price range, maximum (in dollars per share) $ 29.34
Options outstanding (in shares) | shares 0.2
Options outstanding (in dollars per share) $ 28.93
Options outstanding, average remaining life 9 years
Options vested (in shares) | shares 0.0
Options vested (in dollars per share) $ 28.60
$29.35 - $31.46  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price range, minimum (in dollars per share) 29.35
Exercise price range, maximum (in dollars per share) $ 31.46
Options outstanding (in shares) | shares 2.2
Options outstanding (in dollars per share) $ 31.37
Options outstanding, average remaining life 9 years
Options vested (in shares) | shares 0.2
Options vested (in dollars per share) $ 31.12
$31.47 - $33.43  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price range, minimum (in dollars per share) 31.47
Exercise price range, maximum (in dollars per share) $ 33.43
Options outstanding (in shares) | shares 0.5
Options outstanding (in dollars per share) $ 33.39
Options outstanding, average remaining life 8 years
Options vested (in shares) | shares 0.1
Options vested (in dollars per share) $ 33.34
$33.44 - $33.66  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price range, minimum (in dollars per share) 33.44
Exercise price range, maximum (in dollars per share) $ 33.66
Options outstanding (in shares) | shares 0.1
Options outstanding (in dollars per share) $ 33.66
Options outstanding, average remaining life 10 years
Options vested (in shares) | shares 0.1
Options vested (in dollars per share) $ 33.66