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Share-Based Compensation (Outstanding and Exercisable Options) (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding, number of options (in options)   4,598,400
Options outstanding, weighted average remaining (in years)   4 years 2 months 12 days
Options outstanding, weighted average exercise price (in dollars per option)   $ 29.77
Options exercisable, number of options (in options)   3,460,800
Options exercisable, weighted average exercise price (in dollars per option)   $ 31.47
$20.00-$33.00    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding, number of options (in options)   4,087,200
Options outstanding, weighted average remaining (in years)   4 years 7 months 6 days
Options outstanding, weighted average exercise price (in dollars per option)   $ 26.68
Options exercisable, number of options (in options)   2,949,500
Options exercisable, weighted average exercise price (in dollars per option)   $ 26.90
$45.00-$51.00    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding, number of options (in options)   33,000.0
Options outstanding, weighted average remaining (in years)   1 year
Options outstanding, weighted average exercise price (in dollars per option)   $ 45.49
Options exercisable, number of options (in options)   33,000.0
Options exercisable, weighted average exercise price (in dollars per option)   $ 45.49
$55.00-$57.00    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding, number of options (in options)   478,200
Options outstanding, weighted average remaining (in years)   4 months 24 days
Options outstanding, weighted average exercise price (in dollars per option)   $ 56.93
Options exercisable, number of options (in options)   478,300
Options exercisable, weighted average exercise price (in dollars per option)   $ 56.93
Minimum | $20.00-$33.00    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding, exercise price range, lower range limit $ 20.00  
Minimum | $45.00-$51.00    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding, exercise price range, lower range limit 45.00  
Minimum | $55.00-$57.00    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding, exercise price range, lower range limit 55.00  
Maximum | $20.00-$33.00    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding, exercise price range, upper range limit 33.00  
Maximum | $45.00-$51.00    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding, exercise price range, upper range limit 51.00  
Maximum | $55.00-$57.00    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding, exercise price range, upper range limit $ 57.00