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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, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net income attributable to common shareholders $ 63.1 $ 55.0
Average basic shares outstanding 59.3 58.2
Effect of dilutive stock options 1.0 0.7
Average diluted shares outstanding 60.3 58.9
Earnings per share - basic:    
Net income attributable to common shareholders $ 1.06 $ 0.95
Earnings per share - diluted:    
Net income attributable to common shareholders $ 1.05 $ 0.93