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Incentive Plans (Narrative) (Details) - USD ($)
1 Months Ended 6 Months Ended
Feb. 28, 2015
Jun. 30, 2015
Jun. 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 $ 3,100,000
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