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Stock Compensation Plans (Details 2) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Options Vested or Expected to Vest      
Number of Options (in shares) 526,611    
Weighted-Average Remaining Contractual Life 6 years 2 months 12 days    
Weighted-Average Exercise Price (in dollars per share) $ 31.93    
Aggregate Intrinsic Value $ 16.1    
Options Exercisable      
Number of Options (in shares) 232,594    
Weighted-Average Exercise Price (in dollars per share) $ 23.76    
Aggregate Intrinsic Value $ 9.0    
Closing market price for common stock (in dollars per share) $ 62.43    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 5.5 $ 12.7 $ 9.8
$7.41 $19.25 | Stock options      
Exercise Price      
Exercise price, low end of range (in dollars per share) $ 7.41    
Exercise price, high end of range (in dollars per share) $ 19.25    
Options Vested or Expected to Vest      
Number of Options (in shares) 97,636    
Weighted-Average Remaining Contractual Life 3 years 10 months 24 days    
Weighted-Average Exercise Price (in dollars per share) $ 13.06    
Aggregate Intrinsic Value $ 4.8    
Options Exercisable      
Number of Options (in shares) 97,636    
Weighted-Average Exercise Price (in dollars per share) $ 13.06    
Aggregate Intrinsic Value $ 4.8    
$21.13 $32.84 | Stock options      
Exercise Price      
Exercise price, low end of range (in dollars per share) $ 21.13    
Exercise price, high end of range (in dollars per share) $ 32.84    
Options Vested or Expected to Vest      
Number of Options (in shares) 250,022    
Weighted-Average Remaining Contractual Life 5 years 10 months 24 days    
Weighted-Average Exercise Price (in dollars per share) $ 26.07    
Aggregate Intrinsic Value $ 9.1    
Options Exercisable      
Number of Options (in shares) 93,919    
Weighted-Average Exercise Price (in dollars per share) $ 26.99    
Aggregate Intrinsic Value $ 3.3    
$35.92 $42.82 | Stock options      
Exercise Price      
Exercise price, low end of range (in dollars per share) $ 35.92    
Exercise price, high end of range (in dollars per share) $ 42.82    
Options Vested or Expected to Vest      
Number of Options (in shares) 89,723    
Weighted-Average Remaining Contractual Life 6 years 9 months 18 days    
Weighted-Average Exercise Price (in dollars per share) $ 41.86    
Aggregate Intrinsic Value $ 1.9    
Options Exercisable      
Number of Options (in shares) 35,513    
Weighted-Average Exercise Price (in dollars per share) $ 40.38    
Aggregate Intrinsic Value $ 0.8    
$50.60 $59.72 | Stock options      
Exercise Price      
Exercise price, low end of range (in dollars per share) $ 50.60    
Exercise price, high end of range (in dollars per share) $ 59.72    
Options Vested or Expected to Vest      
Number of Options (in shares) 89,230    
Weighted-Average Remaining Contractual Life 9 years    
Weighted-Average Exercise Price (in dollars per share) $ 59.07    
Aggregate Intrinsic Value $ 0.3    
Options Exercisable      
Number of Options (in shares) 5,526    
Weighted-Average Exercise Price (in dollars per share) $ 50.87    
Aggregate Intrinsic Value $ 0.1