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Stock-Based Compensation Plans (Details) - Jun. 30, 2015 - $ / shares
Total
Shares  
Exercised (in shares) (54,196)
2009 Plan | Stock Options  
Shares  
Options outstanding at the beginning of the period (in shares) 340,062
Exercised (in shares) (42,268)
Forfeited (in shares) 0
Options outstanding at the end of the period (in shares) 297,794
Options exercisable at the end of the period (in shares) 236,380
Weighted average exercise price per share  
Options outstanding at the beginning of the period (in dollars per share) $ 122.67
Exercised (in dollars per share) 124.52
Forfeited (in dollars per share) 0.00
Options outstanding at the end of the period (in dollars per share) 122.40
Options exercisable at the end of the period (in dollars per share) $ 120.70
1994 Plan | Stock Options  
Shares  
Options outstanding at the beginning of the period (in shares) 272,402
Exercised (in shares) (11,928)
Forfeited (in shares) 0
Options outstanding at the end of the period (in shares) 260,474
Options exercisable at the end of the period (in shares) 260,474
Weighted average exercise price per share  
Options outstanding at the beginning of the period (in dollars per share) $ 104.96
Exercised (in dollars per share) 138.82
Forfeited (in dollars per share) 0.00
Options outstanding at the end of the period (in dollars per share) 103.41
Options exercisable at the end of the period (in dollars per share) $ 103.41