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Inventory (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of inventory
  

June 30,

2019

   September 30,
2018
 
    (in millions) 
Component parts  $3.7   $3.6 
Finished goods   1.9    1.6 
Total inventories  $5.6   $5.2