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Share and Unit-Based Plans - SARs (Details)
9 Months Ended
Sep. 30, 2015
$ / shares
shares
SARs  
SARs (in shares)  
Balance at beginning of period (in shares) | shares 772,639
Granted (in shares) | shares 0
Exercised (in shares) | shares (344,981)
Forfeited (in shares) | shares 0
Balance at end of period (in shares) | shares 427,658
Value (in dollars per share)  
Balance at beginning of period (in dollars per share) $ 56.67
Granted (in dollars per share) 0.00
Vested (in dollars per share) 56.88
Forfeited (in dollars per share) 0.00
Balance at end of period (in dollars per share) $ 56.50
Stock options  
Stock Options (in shares)  
Balance at beginning of period (in shares) | shares 10,068
Granted (in shares) | shares 0
Exercised (in shares) | shares 0
Forfeited (in shares) | shares 0
Balance at end of period (in shares) | shares 10,068
Value (in dollars per share)  
Balance at beginning of period (in dollars per share) $ 59.57
Granted (in dollars per share) 0.00
Exercised (in dollars per share) 0.00
Forfeited (in dollars per share) 0.00
Balance at end of period (in dollars per share) $ 59.57