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Management Compensation Plans (Schedule of Summary of Changes in Performance-based RSUs Outstanding) (Details) - Performance Shares [Member]
shares in Thousands
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
As of beginning of period, number of units | shares 812
Vested, number of units | shares (663)
Forfeited, number of units | shares (88)
As of end of period, number of units | shares 650
As of beginning of period, weighted average fair value | $ / shares $ 75.25
Vested, weighted average fair value | $ / shares 56.14
Forfeited, weighted average fair value | $ / shares 90.70
As of end of period, weighted average fair value | $ / shares $ 89.86
2015 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, number of units | shares 259
Granted, weighted average fair value | $ / shares $ 92.61
2013 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, number of units | shares 330 [1]
Granted, weighted average fair value | $ / shares $ 56.14 [1]
[1]
Represents additional 2016 performance-based RSU grants that were awarded in 2019 as a result of achieving internal profitability targets.