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Stock Transactions And Stock-Based Compensation - Summary Of Options Outstanding (Details)
shares in Millions
12 Months Ended
Dec. 31, 2020
$ / shares
shares
$7.07 to 12.54  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower limit (in USD per share) $ 7.07
Exercise price, upper limit (in USD per share) $ 12.54
Outstanding, shares (in shares) | shares 0.4
Outstanding, average exercise price (in USD per share) $ 9.66
Outstanding, average remaining life (in years) 2 years 4 months 24 days
Exercisable, shares (in shares) | shares 0.4
Exercisable, average exercise price (in USD per share) $ 9.66
$12.55 to 16.51  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower limit (in USD per share) 12.55
Exercise price, upper limit (in USD per share) $ 16.51
Outstanding, shares (in shares) | shares 2.1
Outstanding, average exercise price (in USD per share) $ 14.63
Outstanding, average remaining life (in years) 5 years 6 months
Exercisable, shares (in shares) | shares 1.3
Exercisable, average exercise price (in USD per share) $ 14.24
$16.52 to 21.76  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower limit (in USD per share) 16.52
Exercise price, upper limit (in USD per share) $ 21.76
Outstanding, shares (in shares) | shares 3.1
Outstanding, average exercise price (in USD per share) $ 20.34
Outstanding, average remaining life (in years) 7 years 8 months 12 days
Exercisable, shares (in shares) | shares 0.6
Exercisable, average exercise price (in USD per share) $ 20.20
$21.77 to $26.50  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower limit (in USD per share) 21.77
Exercise price, upper limit (in USD per share) $ 26.50
Outstanding, shares (in shares) | shares 2.3
Outstanding, average exercise price (in USD per share) $ 25.69
Outstanding, average remaining life (in years) 9 years 1 month 6 days
Exercisable, shares (in shares) | shares 0.0
Exercisable, average exercise price (in USD per share) $ 0
$26.51 to 29.12  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price, lower limit (in USD per share) 26.51
Exercise price, upper limit (in USD per share) $ 29.12
Outstanding, shares (in shares) | shares 0.2
Outstanding, average exercise price (in USD per share) $ 27.23
Outstanding, average remaining life (in years) 8 years 7 months 6 days
Exercisable, shares (in shares) | shares 0.0
Exercisable, average exercise price (in USD per share) $ 0