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Equity Incentive Programs (Schedule of Stock Option Activity Roll Forward) (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Shares Under Option      
Outstanding at beginning of period (in shares) 514,876    
Granted (in shares) 0 0  
Exercised (in shares) 0    
Canceled/forfeited/expired (in shares) (259,914)    
Outstanding at end of period (in shares) 254,962   514,876
Weighted Average Exercise Price      
Outstanding at beginning of period (in dollars per share) $ 27.49    
Granted (in dollars per share) 0    
Exercised (in dollars per share) 0    
Canceled/forfeited/expired (in dollars per share) 41.10    
Outstanding at end of period (in dollars per share) $ 13.62   $ 27.49
Weighted Average Remaining Contractual Term (years)      
Outstanding at beginning of period (in years) 8 months 12 days   6 months
Outstanding at end of period (in years) 8 months 12 days   6 months
Aggregate Intrinsic Value (millions)      
Outstanding at beginning of period $ 0.0    
Outstanding at end of period $ 0.0   $ 0.0