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Unaudited Condensed Consolidated Statement Of Shareholders' Equity - 3 months ended Mar. 31, 2017 - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
BALANCE at period start (in shares) at Dec. 31, 2016   120,562,149      
BALANCE at period start at Dec. 31, 2016 $ 2,310.3 $ 1.2 $ 18.2 $ 3,133.3 $ (842.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 98.1     98.1  
Repurchases of common stock (0.4)       (0.4)
Stock-based compensation expense 4.6   4.6    
Shares awarded under stock-based compensation plans 21.5   (6.0)   27.5
Other 0.1   0.2 (0.1)  
BALANCE at period end (in shares) at Mar. 31, 2017   120,562,149      
BALANCE at period end at Mar. 31, 2017 $ 2,434.2 $ 1.2 $ 17.0 $ 3,231.3 $ (815.3)