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Unaudited Condensed Consolidated Statement Of Shareholders' Equity - 9 months ended Sep. 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 303.3     303.3  
Repurchases of common stock (100.0)       (100.0)
Stock-based compensation expense 22.0   22.0    
Shares awarded under stock-based compensation plans, net of shares withheld for taxes 13.3   (6.3)   19.6
Cumulative effect of change in accounting principle - revenue recognition 10.1     10.1  
BALANCE at period end (in shares) at Sep. 30, 2018   102,562,149      
BALANCE at period end at Sep. 30, 2018 $ 2,618.0 $ 1.0 $ 19.7 $ 3,145.6 $ (548.3)