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Basis Of Presentation Stock-Based Compensation (Details)
shares in Millions
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSUs and PSUs shares awarded subject to approval of the Amended and Restated Long-Term Incentive Plan 0.8
Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Granted in Period 0.4
Options Granted in Period, Weighted Average Exercise Price | $ / shares $ 25.35
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSUs Granted in Period 1.1
RSUs Granted in Period, Weighted Average Grant Date Fair Value | $ / shares $ 25.45