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Inventory (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory
   September 30,
2020
   December 31,
2019
 
   (in millions) 
Component parts  $12.6   $12.7 
Work in progress   2.0    2.1 
Finished goods   2.3    4.0 
Total inventories  $16.9   $18.8