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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%