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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date per share fair value (in dollars per share) $ 19.66    
Risk-free interest rate 2.40% 2.80% 2.30%
Expected life in years 7 years 4 months 24 days 7 years 9 months 18 days 6 years
Expected volatility (over expected life) 22.10% 22.30% 19.40%
Expected dividend yield (over expected life) 3.70% 4.20% 3.10%
Award Year 2016      
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 (in shares) 0.0    
Cash Portion $ 0.0    
Award Year 2017      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
TSR Performance Relative to the  Peer Group (1%=Best) 63.00%    
Payout as a Percent of the Base Award 49.00%    
Number of Shares Distributed (in shares) 0.1   0.1
Cash Portion $ 1.6   $ 2.2
Award Year 2018      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
TSR Performance Relative to the  Peer Group (1%=Best) 60.00%    
Payout as a Percent of the Base Award 56.00%    
Number of Shares Distributed (in shares) 0.1    
Cash Portion $ 2.0    
Award Year 2018, PSU - EBIT CAGR      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout as a Percent of the Base Award 16.00%    
Number of Shares Distributed (in shares) 0.1    
Cash Portion $ 0.4    
TSR Based | Performance Stock Unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total shares base award (in shares) 0.1 0.1 0.1
Grant date per share fair value (in dollars per share) $ 38.23 $ 57.86 $ 42.60
Risk-free interest rate 1.40% 2.40% 2.40%
Expected life in years 3 years 3 years 3 years
Expected volatility (over expected life) 24.00% 21.50% 19.90%
Expected dividend yield (over expected life) 3.60% 3.40% 3.30%
EBIT CAGR Based | Performance Stock Unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total shares base award (in shares) 0.1 0.1 0.1
Grant date per share fair value (in dollars per share) $ 40.52 $ 39.98 $ 40.92
Vesting period in years 3 years 3 years 3 years