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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2013 $ 554.2 $ 0.4 $ 70.4 $ (3.6) $ 452.5 $ 34.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Comprehensive income 167.9       217.9 (50.0)
Dividends on common stock/equity awards (80.7)   0.2   (80.9)  
Shares issued for stock units 0.0   (0.1) 0.1    
Income tax deficiencies from equity awards (0.2)   (0.2)      
Stock options exercised 7.5   7.3 0.2    
Stock-based compensation 4.9   4.9      
Balance at Dec. 31, 2014 653.6 0.4 82.5 (3.3) 589.5 (15.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Comprehensive income 66.4       159.2 (92.8)
Dividends on common stock/equity awards (89.4)   0.2   (89.6)  
Income tax benefits from equity awards 0.5   0.5      
Stock options exercised 2.5   2.4 0.1    
Stock-based compensation 6.1   6.1      
Balance at Dec. 31, 2015 639.7 0.4 91.7 (3.2) 659.1 (108.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Comprehensive income 166.1       162.7 3.4
Dividends on common stock/equity awards (94.1)   0.2   (94.3)  
Shares issued for stock units 0.0   (0.2) 0.2    
Income tax deficiencies from equity awards (0.2)   (0.2)      
Stock options exercised 0.7   0.7    
Stock-based compensation 4.9   4.9      
Balance at Dec. 31, 2016 $ 717.1 $ 0.4 $ 97.1 $ (3.0) $ 727.5 $ (104.9)