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Equity (Stock-based Compensation Plans) (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 01, 2017
Vesting period 4 years      
Weighted average remaining contractual life 3 years 7 months 6 days      
Total intrinsic value of options exercised $ 1.5 $ 4.6 $ 55.6  
Unvested number of shares 1,200,000      
Unrecognized compensation cost $ 13.0      
Weighted average period over which unrecognized compensation cost will be recognized 2 years 6 months      
Restricted Stock [Member]        
Value of equity classified RSUs vested $ 11.5      
Unrecognized compensation cost $ 3.5      
Weighted average period over which unrecognized compensation cost will be recognized 1 year 10 months 24 days      
Employee Stock Option [Member]        
Expected option term   6 years    
2012 Plan [Member]        
Expected option term 10 years      
Equity Incentive Plan, shares authorized 3,000,000      
2012 Plan [Member] | Subsequent Event [Member]        
Increase of shares reserved       500,000
2012 Plan [Member] | Employee Stock Option [Member]        
Vesting period 4 years