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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

 

(1.9)% - 15.9%

Market revenue shares at maturity

 

0.6% - 44.0%

Operating income margins at maturity

 

19.2% - 32.6%

Discount rate

 

9.5%