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Stock Compensation Plans - Outstanding and Exercisable Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Options Vested or Expected to Vest      
Number of Options (in shares) 451,081    
Weighted- Average Remaining Contractual Life (Years) 7 years    
Weighted-Average Exercise Price (in dollars per share) $ 67.46    
Aggregate Intrinsic Value $ 2.7    
Options Exercisable      
Number of Options (in shares) 240,903    
Weighted-Average Exercise Price (in dollars per share) $ 53.37    
Aggregate Intrinsic Value $ 2.6    
Closing market price for common stock (in dollars per share) $ 58.92    
Intrinsic value, exercises in the period $ 5.2 $ 11.5 $ 4.7
$8.04 — $13.38 | Stock Options      
Exercise Price      
Exercise price, low end of range (in dollars per share) $ 8.04    
Exercise price, high end of range (in dollars per share) $ 13.38    
Options Vested or Expected to Vest      
Number of Options (in shares) 10,250    
Weighted- Average Remaining Contractual Life (Years) 9 months 18 days    
Weighted-Average Exercise Price (in dollars per share) $ 11.19    
Aggregate Intrinsic Value $ 0.5    
Options Exercisable      
Number of Options (in shares) 10,250    
Weighted-Average Exercise Price (in dollars per share) $ 11.19    
Aggregate Intrinsic Value $ 0.5    
$18.90 — $31.23 | Stock Options      
Exercise Price      
Exercise price, low end of range (in dollars per share) $ 18.90    
Exercise price, high end of range (in dollars per share) $ 31.23    
Options Vested or Expected to Vest      
Number of Options (in shares) 49,027    
Weighted- Average Remaining Contractual Life (Years) 3 years 2 months 12 days    
Weighted-Average Exercise Price (in dollars per share) $ 26.02    
Aggregate Intrinsic Value $ 1.6    
Options Exercisable      
Number of Options (in shares) 49,027    
Weighted-Average Exercise Price (in dollars per share) $ 26.02    
Aggregate Intrinsic Value $ 1.6    
$42.82 — $74.20 | Stock Options      
Exercise Price      
Exercise price, low end of range (in dollars per share) $ 42.82    
Exercise price, high end of range (in dollars per share) $ 74.20    
Options Vested or Expected to Vest      
Number of Options (in shares) 160,837    
Weighted- Average Remaining Contractual Life (Years) 6 years 6 months    
Weighted-Average Exercise Price (in dollars per share) $ 55.74    
Aggregate Intrinsic Value $ 0.6    
Options Exercisable      
Number of Options (in shares) 127,836    
Weighted-Average Exercise Price (in dollars per share) $ 55.10    
Aggregate Intrinsic Value $ 0.5    
$74.70 — $93.35 | Stock Options      
Exercise Price      
Exercise price, low end of range (in dollars per share) $ 74.70    
Exercise price, high end of range (in dollars per share) $ 93.35    
Options Vested or Expected to Vest      
Number of Options (in shares) 230,967    
Weighted- Average Remaining Contractual Life (Years) 8 years 6 months    
Weighted-Average Exercise Price (in dollars per share) $ 86.92    
Aggregate Intrinsic Value $ 0.0    
Options Exercisable      
Number of Options (in shares) 53,790    
Weighted-Average Exercise Price (in dollars per share) $ 82.23    
Aggregate Intrinsic Value $ 0.0