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Equity Incentive Programs (Schedule of Stock Option Activity Roll Forward) (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Shares Under Option          
Outstanding at beginning of period (in shares)     3,290,336    
Granted (in shares) 0 0 0 0  
Exercised (in shares)     (130,424)    
Canceled/forfeited/expired (in shares)     (21,485)    
Outstanding at end of period (in shares) 3,138,427   3,138,427   3,290,336
Exercisable at end of period (in shares) 3,138,427   3,138,427    
Weighted Average Exercise Price          
Outstanding at beginning of period (in dollars per share)     $ 21.37    
Granted (in dollars per share)     0.00    
Exercised (in dollars per share)     13.96    
Canceled/forfeited/expired (in dollars per share)     26.54    
Outstanding at end of period (in dollars per share) $ 21.64   21.64   $ 21.37
Exercisable at end of period (in dollars per share) $ 21.64   $ 21.64    
Weighted Average Remaining Contractual Term (years)          
Outstanding at beginning of period (in years)     3 years   3 years 7 months
Outstanding at end of period (in years)     3 years   3 years 7 months
Exercisable at end of period (in years)     3 years    
Aggregate Intrinsic Value (millions)          
Outstanding at beginning of period     $ 0.0    
Outstanding at end of period $ 13.4   13.4   $ 0.0
Exercisable at end of period $ 13.4   $ 13.4