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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Class A
Common Stock
Class B
Additional Paid-In Capital
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adjustment to adopt new accounting principles $ 1.4       $ 1.4
Balance (in shares) at Dec. 31, 2017   23.9 1.0    
Balance at Dec. 31, 2017 1,083.2 $ 149.1 $ 0.1 $ 11.3 922.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 265.7       265.7
Issuance of stock in connection with employee stock plans (in shares)   0.1      
Issuance of stock in connection with employee stock plans 10.1 $ 10.1      
Issuance of restricted stock to employees (in shares)   0.1      
Repurchase of Class A common stock (in shares)   (2.1)      
Repurchase of Class A common stock (148.9) $ (168.5)   19.6  
Compensation for stock and stock option issuances and excess tax benefits from option exercises 13.4 $ 9.3   4.1  
Dividends paid (27.7)       (27.7)
Balance (in shares) at Dec. 31, 2018   22.0 1.0    
Balance at Dec. 31, 2018 1,197.2 $ 0.0 $ 0.1 35.0 1,162.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adjustment to adopt new accounting principles 0.9       0.9
Net income 56.4       56.4
Issuance of stock in connection with employee stock plans (in shares)   0.0      
Issuance of stock in connection with employee stock plans 2.3 $ 2.3      
Issuance of restricted stock to employees (in shares)   0.1      
Repurchase of Class A common stock (3.1) $ (3.1)      
Class B common stock converted to Class A common stock (in shares)   0.2 0.2    
Class B common stock converted to Class A common stock 0.0        
Compensation for stock and stock option issuances and excess tax benefits from option exercises 3.5 $ 10.5   (7.0)  
Dividends paid (6.7)       (6.7)
Balance (in shares) at Mar. 31, 2019   22.3 0.8    
Balance at Mar. 31, 2019 $ 1,250.5 $ 9.7 $ 0.1 $ 28.0 $ 1,212.7