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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Earnings Per Share [Abstract]    
Net income attributable to common shareholders $ 105.7 $ 105.0
Average basic shares outstanding (in shares) 56.5 57.1
Effect of dilutive stock options (in shares) 0.8 0.8
Average diluted shares outstanding (in shares) 57.3 57.9
Earnings per basic share (in dollars per share) $ 1.87 $ 1.84
Earnings per diluted share (in dollars per share) $ 1.84 $ 1.81