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Earnings Per Share (Schedule Of Basic And Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income $ 49 $ 61 $ 111 $ 134
Weighted-average common shares outstanding 85.3 84.7 85.2 84.6
Weighted average common shares outstanding - assuming dilution 85.6 84.9 85.5 84.8
Basic earnings per share (in dollars per share) $ 0.57 $ 0.72 $ 1.30 $ 1.59
Diluted earnings per share (in dollars per share) $ 0.57 $ 0.72 $ 1.29 $ 1.58
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 0.9 0.3 0.7 0.5
RSU        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Effect of dilutive securities 0.2 0.2 0.2 0.1
Options        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Effect of dilutive securities [1] 0.1 0.1 0.1 0.1
[1] Options to purchase 0.9 million and 0.7 million shares for the three and nine months ended September 30, 2020, respectively, and 0.3 million and 0.5 million shares for the three and nine months ended 2019, respectively, were not included in the diluted earnings per share calculation because their effect would have been anti-dilutive.