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Inventory (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory

Inventory consists of the following:

 

  

June 30,

2021

  

December 31,

2020

 
   (in millions) 
Component parts  $11.2   $12.1 
Work in progress   0.8    1.7 
Finished goods   2.3    3.8 
Total inventories  $14.3   $17.6