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Earnings Per Share (Comparison Of Basic And Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Basic earnings per share:    
Net income $ 80.3 $ 74.1
Weighted average common shares outstanding 87,291,369 90,254,512
Basic earnings per share $ 0.92 $ 0.82
Diluted earnings per share:    
Net income $ 80.3 $ 74.1
Weighted average common shares outstanding 87,291,369 90,254,512
Share equivalents:    
Warrants and options 987,726 832,747
RSUs and performance-based equity awards 854,117 451,268
Employee share purchase plan 0 20,698
Weighted average common shares and common share equivalents outstanding - diluted 89,133,212 91,559,225
Diluted earnings per share $ 0.90 $ 0.81