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Stock Plans (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
ShareBasedCompensationPlan
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of stock-based compensation plan under which grants were made 6  
Number of stock-based compensation plan under which grants were not made 4  
Shares authorized for grant under the plans (in shares) 22,540,761  
Shares available for grant under the plan (in shares) 14,543,220  
Non Employee Directors Compensation Plans    
Number of stock options award received by each non-employee director (in shares)    0
Performance Shares [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expense recognized during the period $ 1.0 $ 0.3
Performance Shares    
Initial period over which target number of performance shares are awarded 90 days  
Measurement period 3 years  
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expense recognized during the period 4.4 3.8
Restricted Stock    
Remaining unrecognized compensation cost associated with unvested restricted stock awards $ 33.5  
Weighted average period over which unvested restricted stock awards unrecognized compensation cost is expected to be recognized (in years) 2 years