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Incentive Plans (Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended
Feb. 04, 2014
Feb. 28, 2015
Sep. 30, 2015
Sep. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Income tax benefits realized for the tax deductions from option exercises     $ 0 $ 3,800,000
2012 Long-Term Plan [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Long term plan expiration year     2022  
Maximum number of shares available for issuance     8,700,000  
Maximum number of shares available for issuance, annual rate     1.00%  
Employee Stock Purchase Plan [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Maximum number of shares available for issuance     980,000  
Stock Options [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted stock options   991,000    
Stock-based compensation, fair value assumption model     Black-Scholes valuation model  
Granted stock options, valuation per option   $ 10.97    
Stock Options [Member] | Minimum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted stock options, exercise price   49.65    
Stock Options [Member] | Maximum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted stock options, exercise price   $ 51.63    
Performance Based Restricted Share Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock-based compensation, fair value assumption model     Monte Carlo valuation model  
Granted restricted stock   455,000    
Performance Based Restricted Share Awards [Member] | Minimum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted restricted stock, fair value   $ 44.03    
Performance Based Restricted Share Awards [Member] | Maximum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted restricted stock, fair value   $ 48.12    
Time Based Restricted Stock Units [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted restricted stock   233,400    
Granted restricted stock, fair value $ 49.65      
Time Based Restricted Stock Units [Member] | Non-Employee Director Plan [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted restricted stock   48,665    
Granted restricted stock, vesting scheme     These shares vest on the third anniversary of the date of grant.  
Time Based Restricted Stock Units [Member] | Non-Employee Director Plan [Member] | Minimum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted restricted stock, fair value   $ 49.09    
Time Based Restricted Stock Units [Member] | Non-Employee Director Plan [Member] | Maximum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted restricted stock, fair value   $ 50.90    
SAR [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted stock options   847,400    
Cash-Settled RSU (RSU-C) [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted restricted stock   616,790