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Goodwill and Intangible Assets Goodwill and Other Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]  
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]
The following table provides a breakout of the major intangible assets acquired by class:
 
Estimated
 
December 31,
 
Useful Lives
 
2017
 
(years)
 
(in millions)
MPG
 
 
 
Customer platforms
14
 
$
950.0

Customer relationships
16-17
 
151.8

Technology and other
5-13
 
121.3

Total MPG
 
 
$
1,223.1

 
 
 
 
USM Mexico
 
 
 
Technology
13
 
$
29.5

Customer platforms
13
 
2.2

Total USM Mexico
 
 
$
31.7

 
 
 
 
Total
 
 
$
1,254.8