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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories consisted of the following:
 

As of December 31,
 

2018
 
2017
Parts and work-in-process

$
130.5

 
$
128.7

Finished goods

85.1

 
114.4

Total inventories

$
215.6

 
$
243.1