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Share-Based Compensation (Summary Of Stock Options Granted To Employees And Non-Employee Directors) (Details) - $ / shares
9 Months Ended 12 Months Ended
Oct. 04, 2015
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Document Period End Date   Dec. 31, 2019    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   381,561    
Stock-Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Options outstanding at beginning of period, Options   742,658    
Granted, Options   153,726    
Exercised, Options   (6,516)    
Forfeited, Options   (108,013)    
Expired, Options   (69,355) 0 0
Options outstanding at end of period, Options   712,500 742,658  
Options exercisable at end of period, Options   457,778,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Options outstanding at beginning of period, Weighted Average Exercise Price   $ 50.26    
Granted, Weighted Average Exercise Price   33.63    
Exercised, Weighted Average Exercise Price $ 41.17 38.89    
Forfeited, Weighted Average Exercise Price   68.79    
Expired, Weighted Average Exercise Price   52.35   $ 0
Options outstanding at end of period, Weighted Average Exercise Price   43.76 $ 50.26  
Options exercisable at end of period, Weighted Average Exercise Price   $ (46.12)    
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   274,959 226,683  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   205,291 167,480  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   (59,450)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (97,565)    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercisable Number   5,689,000    
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeited In Period, Weighted Average Price   $ 39.99    
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Settled In Period, Weighted Average Price   44.06    
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period, Weighted Average Price   32.92 $ 42.87  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Weighted Average Price   38.51 $ 45.66  
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercisable Number, Weighted Average Price   $ 51.71    
Restricted Stock Units Management Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   106,602 72,113  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   56,379 34,937  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   (16,866)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (5,024)    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercisable Number   5,446,000 7,972,000  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeited In Period, Weighted Average Price   $ 26.34    
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Settled In Period, Weighted Average Price   28.81    
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grants In Period, Weighted Average Price   22.53    
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Weighted Average Price   28.06 $ 32.25  
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercisable Number, Weighted Average Price   $ 31.90