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Inventory (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventory

   December 31,
2019
   September 30,
2018
 
   (in millions) 
Component parts  $12.7   $3.6 
Work in progress   2.1     
Finished goods   4.0    1.6 
Total inventories  $18.8   $5.2