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Stock Transactions And Stock-Based Compensation (Summary Of Options Outstanding) (Details)
shares in Millions
12 Months Ended
Dec. 31, 2019
$ / shares
shares
$5.42 to 9.74  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, shares (in shares) | shares 0.4
Outstanding, average exercise price (in USD per share) $ 8.11
Outstanding, average remaining life (in years) 3 years
Exercisable, shares (in shares) | shares 0.4
Exercisable, average exercise price (in USD per share) $ 8.11
Exercise price, lower limit (in USD per share) 5.42
Exercise price, upper limit (in USD per share) $ 9.74
$10.53 to 14.12  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, shares (in shares) | shares 1.6
Outstanding, average exercise price (in USD per share) $ 12.52
Outstanding, average remaining life (in years) 6 years
Exercisable, shares (in shares) | shares 0.9
Exercisable, average exercise price (in USD per share) $ 12.38
Exercise price, lower limit (in USD per share) 10.53
Exercise price, upper limit (in USD per share) $ 14.12
$15.27 to 19.49  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, shares (in shares) | shares 3.3
Outstanding, average exercise price (in USD per share) $ 17.83
Outstanding, average remaining life (in years) 8 years
Exercisable, shares (in shares) | shares 0.6
Exercisable, average exercise price (in USD per share) $ 17.18
Exercise price, lower limit (in USD per share) 15.27
Exercise price, upper limit (in USD per share) $ 19.49
$21.76 to 22.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, shares (in shares) | shares 2.3
Outstanding, average exercise price (in USD per share) $ 21.80
Outstanding, average remaining life (in years) 9 years
Exercisable, shares (in shares) | shares 0.0
Exercisable, average exercise price (in USD per share) $ 0
Exercise price, lower limit (in USD per share) 21.76
Exercise price, upper limit (in USD per share) $ 22.00
$25.13 to 27.82  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, shares (in shares) | shares 0.4
Outstanding, average exercise price (in USD per share) $ 26.59
Outstanding, average remaining life (in years) 10 years
Exercisable, shares (in shares) | shares 0.0
Exercisable, average exercise price (in USD per share) $ 0
Exercise price, lower limit (in USD per share) 25.13
Exercise price, upper limit (in USD per share) $ 27.82