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Inventory (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory
   June 30,
2020
  

December 31,

2019

 
   (in millions) 
Component parts  $13.3   $12.7 
Work in progress   1.5    2.1 
Finished goods   4.2    4.0 
Total inventories  $19.0   $18.8