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Stock-Based Compensation (Details 2) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-based compensation expense      
Compensation expense recognized $ 17.4 $ 15.7 $ 17.0
Deferred Compensation Equity      
Restricted Stock Awards      
Number of common stock deferred (in shares) 253,520 228,047  
Stock options      
Number of Shares      
Outstanding at the beginning of the period (in shares) 2,276,637 2,993,007 3,225,131
Options granted (in shares) 316,345 259,035 283,975
Options exercised (in shares) (748,270) (925,520) (472,040)
Options forfeited (in shares) (34,632) (49,885) (44,059)
Outstanding at the end of the period (in shares) 1,810,080 2,276,637 2,993,007
Weighted Average Price      
Outstanding at the beginning of the period (in dollars per share) $ 42.32 $ 38.76 $ 35.88
Options granted (in dollars per share) 92.84 73.08 64.80
Options exercised (in dollars per share) 38.44 38.63 33.81
Options forfeited (in dollars per share) 81.68 56.89 48.47
Outstanding at the end of the period (in dollars per share) $ 52.00 $ 42.32 $ 38.76
Weighted-average grant-date fair value $ 6.7 $ 5.0 $ 5.0
Total intrinsic value of options exercised $ 42.7 $ 41.7 $ 15.5
Weighted average contractual term 5 years 7 months 17 days 5 years 8 months 16 days 5 years 8 months 19 days
Number of options exercisable (in shares) 1,281,126 1,666,647 2,378,543
Weighted average exercise price of exercisable options (in dollars per share) $ 39.09 $ 34.24 $ 34.87
The weighted average contractual term of options exercisable 4 years 5 months 5 days 4 years 8 months 19 days  
Aggregate intrinsic value of options outstanding $ 63.5 $ 91.8  
Total grant date fair value of options vested 4.6 4.0 $ 8.0
Stock-based compensation expense      
Compensation expense recognized 5.1 4.5 4.9
Unrecognized compensation cost related to stock options $ 3.7    
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards 1 year 11 months 12 days    
Award Activity      
Units granted (in shares) 316,345    
Restricted stock awards      
Weighted Average Price      
Vesting period of shares awarded under the Program 3 years    
Stock-based compensation expense      
Compensation expense recognized $ 5.9 $ 5.1 $ 4.6
Unrecognized compensation cost related to stock options $ 4.3    
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards 1 year 6 months 29 days    
Award Activity      
Outstanding balance at the beginning of the period (in shares) 246,988 240,990 284,235
Units granted (in shares) 58,040 104,773 71,255
Units vested and issued (in shares) (75,740) (94,590) (109,445)
Units forfeited (in shares) (2,881) (4,185) (5,055)
Outstanding balance at the end of the period (in shares) 226,407 246,988 240,990
Restricted Stock Awards      
Outstanding balance at the beginning of the period (in dollars per share) $ 65.14 $ 49.66 $ 25.99
Grant date fair value (in dollars per share) 90.54 76.70 64.80
Shares vested (in dollars per share) 49.56 38.57 34.08
Shares forfeited (in dollars per share) 81.32 63.73 47.85
Outstanding balance at the end of the period (in dollars per share) $ 76.66 $ 65.14 $ 49.66
Performance share awards      
Weighted Average Price      
Vesting period of shares awarded under the Program 3 years    
Stock-based compensation expense      
Compensation expense recognized $ 6.3 $ 6.0 $ 6.5
Unrecognized compensation cost related to stock options $ 3.7    
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards 1 year 8 months 1 day    
Award Activity      
Outstanding balance at the beginning of the period (in shares) 281,475 328,990 230,730
Units granted (in shares) 58,040 67,970 71,255
Units converted to shares 37,496 69,920 89,610
Units vested and issued (in shares) (112,814) (135,008) (45,544)
Units vested and deferred (in shares) (33,611) (46,212) (12,006)
Units forfeited (in shares) (2,340) (4,185) (5,055)
Outstanding balance at the end of the period (in shares) 228,246 281,475 328,990
Restricted Stock Awards      
Grant date fair value (in dollars per share) $ 112.39 $ 95.72 $ 91.33
2015 Awards      
Award Activity      
Units granted (in shares) 58,040    
Units forfeited (in shares) (1,220)    
Outstanding balance at the end of the period (in shares) 56,820    
2014 Awards      
Award Activity      
Outstanding balance at the beginning of the period (in shares) 66,505    
Units granted (in shares)   67,970  
Units forfeited (in shares) (750) (1,465)  
Outstanding balance at the end of the period (in shares) 65,755 66,505  
2013 Awards      
Award Activity      
Outstanding balance at the beginning of the period (in shares) 68,545 70,175  
Units granted (in shares)     71,255
Units converted to shares 37,496    
Units forfeited (in shares) (370) (1,630) (1,080)
Outstanding balance at the end of the period (in shares) 105,671 68,545 70,175
2012 Awards      
Award Activity      
Outstanding balance at the beginning of the period (in shares) 146,425 77,595 79,340
Units converted to shares   69,920  
Units vested and issued (in shares) (112,814)    
Units vested and deferred (in shares) (33,611)    
Units forfeited (in shares)   (1,090) (1,745)
Outstanding balance at the end of the period (in shares)   146,425 77,595
2011 Awards      
Award Activity      
Outstanding balance at the beginning of the period (in shares)   181,220 93,840
Units converted to shares     89,610
Units vested and issued (in shares)   (135,008)  
Units vested and deferred (in shares)   (46,212)  
Units forfeited (in shares)     (2,230)
Outstanding balance at the end of the period (in shares)     181,220
2010 Awards      
Award Activity      
Outstanding balance at the beginning of the period (in shares)     57,550
Units vested and issued (in shares)     (45,544)
Units vested and deferred (in shares)     (12,006)
Restricted Stock Units      
Award Activity      
Units granted (in shares) 12,157    
Restricted Stock Awards      
Grant date fair value (in dollars per share) $ 90.54