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Unaudited Condensed Consolidated Statement Of Shareholders' Equity - 6 months ended Jun. 30, 2018 - 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, 2017   102,562,149      
BALANCE at period start at Dec. 31, 2017 $ 2,369.3 $ 1.0 $ 4.0 $ 2,832.2 $ (467.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 191.3     191.3  
Repurchases of common stock (100.0)       (100.0)
Stock-based compensation expense 18.4   18.4    
Shares awarded under stock-based compensation plans, net of shares withheld for taxes 11.5   (3.5)   15.0
Cumulative effect of change in accounting principle - revenue recognition 10.1     10.1  
BALANCE at period end (in shares) at Jun. 30, 2018   102,562,149      
BALANCE at period end at Jun. 30, 2018 $ 2,500.6 $ 1.0 $ 18.9 $ 3,033.6 $ (552.9)