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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Net income attributable to common shareholders $ 72.5 $ 97.0 $ 245.9 $ 246.4
Average basic shares outstanding 60.0 59.7 59.9 59.7
Effect of dilutive stock options 0.8 1.4 0.9 1.4
Average diluted shares outstanding 60.8 61.1 60.8 61.1
Earnings per share - basic:        
Net income attributable to common shareholders $ 1.21 $ 1.62 $ 4.11 $ 4.13
Earnings per share - diluted:        
Net income attributable to common shareholders $ 1.19 $ 1.59 $ 4.05 $ 4.04