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Text Block [Abstract]  
Discounted Cash Flow Analyses The key assumptions used in the discounted cash flow analyses are as follows:
 
Revenue growth rates
   
(
14.1
)% - 
7.9%
 
Market revenue shares at maturity
   
0.6
% - 
39.0
%
Operating income margins at maturity
   
26.5
% - 
35.4
%
Discount rate
    9.5%