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Equity Incentive Programs (Schedule of Stock Option Activity Roll Forward) (Details) - Stock Options [Member] - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Shares Under Option      
Outstanding at beginning of period (in shares) 1,702,866    
Granted (in shares) 0 0  
Compensation expense $ 0 $ 0  
Exercised (in shares) (74,803)    
Canceled/forfeited/expired (in shares) (12,392)    
Outstanding at end of period (in shares) 1,615,671   1,702,866
Exercisable (in shares) 1,615,671    
Weighted Average Exercise Price      
Outstanding at beginning of period (in dollars per share) $ 23.00    
Granted (in dollars per share) 0.00    
Exercised (in dollars per share) 17.98    
Canceled/forfeited/expired (in dollars per share) 31.67    
Outstanding at end of period (in dollars per share) 23.17   $ 23.00
Exercisable (in dollars per share) $ 23.17    
Weighted Average Remaining Contractual Term (years)      
Outstanding at beginning of period (in years) 3 years 1 month   3 years 4 months
Outstanding at end of period (in years) 3 years 1 month   3 years 4 months
Exercisable (in years) 3 years 1 month    
Aggregate Intrinsic Value (millions)      
Outstanding at beginning of period $ 12,300,000    
Outstanding at end of period 10,000,000   $ 12,300,000
Exercisable $ 10,000,000