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Goodwill (Tables)
 3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Changes in Carrying Amount of Goodwill
A summary of the changes in the carrying amount of goodwill, by operating segment, in the three months ended March 31, 2018, is shown below (in millions):
 
Seating
 
E-Systems
 
Total
Balance at January 1, 2018
$
1,274.4

 
$
126.9

 
$
1,401.3

Affiliate transaction
—

 
21.4

 
21.4

Foreign currency translation and other
19.3

 
22.7

 
42.0

Balance at March 31, 2018
$
1,293.7

 
$
171.0

 
$
1,464.7