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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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date per share fair value $ 19.23    
Risk-free interest rate 2.20% 2.10% [1] 2.10% [1]
Expected life in years 7 years 11 months 7 years 6 months [1] 6 years [1]
Expected volatility (over expected life) 30.00% 30.50% [1] 35.10% [1]
Expected dividend yield (over expected life) 3.00% 3.00% [1] 3.90% [1]
Performance Stock Unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total shares base award 0.1 0.2 0.2
Grant date per share fair value $ 40.16 $ 42.22 $ 30.45
Risk-free interest rate 1.30% 1.10% 0.80%
Expected life in years 3 years 3 years 3 years
Expected volatility (over expected life) 19.20% 19.80% 25.90%
Expected dividend yield (over expected life) 3.10% 2.90% 3.90%
Award Year 2012      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
TSR Performance Relative to the Peer Group (1%Best)     30.00%
Payout as a Percent of the Base Award     157.00%
Number of Shares Distributed     0.4
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid     $ 9.9
Award Year 2013      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
TSR Performance Relative to the Peer Group (1%Best)   27.00%  
Payout as a Percent of the Base Award   165.40%  
Number of Shares Distributed   0.4  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid   $ 8.5  
Award Year 2014      
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 0.2  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid $ 9.8 $ 6.7  
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