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Other Assets (Tables)
12 Months Ended
Dec. 31, 2019
Other Assets, Noncurrent [Abstract]  
Schedule of other assets

   December 31,
2019
   September 30,
2018
 
   (in millions) 
         
Long term finance lease receivable   1.0    — 
Long term receivables   1.5    2.2 
Pension surplus   —    5.3 
Long term prepaid expenses and other assets   2.6    4.6 
   $5.1   $12.1