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Earnings Per Share (Computation Of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share [Abstract]    
Net income attributable to common shareholders $ 21.7 $ 37.8
Average basic shares outstanding (in shares) 57.3 57.0
Effect of dilutive share-based awards (in shares) 0.6 0.7
Average diluted shares outstanding (in shares) 57.9 57.7
Earnings per basic share (in dollars per share) $ 0.38 $ 0.66
Earnings per diluted share (in dollars per share) $ 0.38 $ 0.66