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Stock Transactions And Stock-Based Compensation (Summary Of Options Outstanding) (Details)
shares in Millions
12 Months Ended
Dec. 31, 2018
$ / shares
shares
$19.89 to 40.45  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, shares (in shares) | shares 0.2
Outstanding, average exercise price (in USD per share) $ 35.68
Outstanding, average remaining life (in years) 3 years
Exercisable, shares (in shares) | shares 0.2
Exercisable, average exercise price (in USD per share) $ 35.80
Exercise price, lower limit (in USD per share) 19.89
Exercise price, upper limit (in USD per share) $ 40.45
$40.46 to 59.17  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, shares (in shares) | shares 0.2
Outstanding, average exercise price (in USD per share) $ 54.85
Outstanding, average remaining life (in years) 5 years
Exercisable, shares (in shares) | shares 0.2
Exercisable, average exercise price (in USD per share) $ 52.78
Exercise price, lower limit (in USD per share) 40.46
Exercise price, upper limit (in USD per share) $ 59.17
$59.18 to 65.95  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, shares (in shares) | shares 0.3
Outstanding, average exercise price (in USD per share) $ 65.84
Outstanding, average remaining life (in years) 7 years
Exercisable, shares (in shares) | shares 0.1
Exercisable, average exercise price (in USD per share) $ 65.75
Exercise price, lower limit (in USD per share) 59.18
Exercise price, upper limit (in USD per share) $ 65.95
$65.96 to 79.63  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, shares (in shares) | shares 0.2
Outstanding, average exercise price (in USD per share) $ 70.76
Outstanding, average remaining life (in years) 7 years
Exercisable, shares (in shares) | shares 0.1
Exercisable, average exercise price (in USD per share) $ 67.77
Exercise price, lower limit (in USD per share) 65.96
Exercise price, upper limit (in USD per share) $ 79.63
$79.64 to 101.65  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, shares (in shares) | shares 0.8
Outstanding, average exercise price (in USD per share) $ 93.74
Outstanding, average remaining life (in years) 9 years
Exercisable, shares (in shares) | shares 0.1
Exercisable, average exercise price (in USD per share) $ 85.97
Exercise price, lower limit (in USD per share) 79.64
Exercise price, upper limit (in USD per share) $ 101.65