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Prepaid Expenses and Other Assets (Tables)
6 Months Ended
Jun. 30, 2019
Prepaid Expense and Other Assets [Abstract]  
Schedule of prepaid expenses and other assets
   June 30,
2019
   September 30,
2018
 
    (in millions) 
Prepaid expenses and other assets  $4.6   $5.0 
Unbilled accounts receivable   7.2    10.8 
Total prepaid expenses and other assets  $11.8   $15.8