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Stock Compensation Plans (SSAR Activity) (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding [Roll Forward]  
SSARs outstanding, end of period, shares 1,081,087
Settled Stock Appreciation Rights (SSARs) [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding [Roll Forward]  
SSARs outstanding, beginning of period, shares 832,060
SSARs granted, shares 305,900
SSARs exercised, shares (36,548)
SSARs canceled or forfeited, shares (20,325)
SSARs outstanding, end of period, shares 1,081,087
Weighted average SSAR exercise prices per share:  
Granted $ 52.89
Exercised $ 26.43
Canceled or forfeited $ 48.84
Outstanding $ 41.46
Minimum [Member] | Settled Stock Appreciation Rights (SSARs) [Member]
 
SSAR price ranges per share:  
Granted $ 51.37
Exercised $ 21.45
Canceled or forfeited $ 43.39
Maximum [Member] | Settled Stock Appreciation Rights (SSARs) [Member]
 
SSAR price ranges per share:  
Granted $ 52.94
Exercised $ 37.38
Canceled or forfeited $ 52.94