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Stock-Based Compensation (Number Of Shares And Related Grant Date Fair Value Of PSU) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date per share fair value (in dollars per share) $ 27.48    
Risk-free interest rate 2.30% 2.30% 2.20%
Expected life in years 6 years 6 years 7 years 11 months
Expected volatility (over expected life) 19.40% 19.80% 30.00%
Expected dividend yield (over expected life) 3.10% 3.10% 3.00%
Performance Stock Unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total shares base award     0.1
Grant date per share fair value (in dollars per share)     $ 40.16
Risk-free interest rate     1.30%
Expected life in years     3 years
Expected volatility (over expected life)     19.20%
Expected dividend yield (over expected life)     3.10%
Award Year 2013      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
TSR Performance Relative to the Peer Group (1%Best)     10.00%
Payout as a Percent of the Base Award     175.00%
Number of Shares Distributed     0.4
Cash Portion     $ 9.8
Award Year 2014      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
TSR Performance Relative to the Peer Group (1%Best)   57.00%  
Payout as a Percent of the Base Award   61.00%  
Number of Shares Distributed   0.0  
Cash Portion   $ 6.9  
Award Year 2015      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
TSR Performance Relative to the Peer Group (1%Best) 78.00%    
Payout as a Percent of the Base Award 0.00%    
Number of Shares Distributed 0.0    
Cash Portion $ 0.0    
Relative Total Shareholder Return | Performance Stock Unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total shares base award 0.1 0.1  
Grant date per share fair value (in dollars per share) $ 42.60 $ 50.75  
Risk-free interest rate 2.40% 1.50%  
Expected life in years 3 years 3 years  
Expected volatility (over expected life) 19.90% 19.50%  
Expected dividend yield (over expected life) 3.30% 2.80%