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Other Assets (Tables)
 6 Months Ended
Jun. 30, 2019
Other Assets, Noncurrent [Abstract]  
Schedule of other assets
   June 30,
2019		   September 30,
2018		 
    (in millions) 
Pension surplus  $2.7   $5.3 
Long term receivables   1.8    2.2 
Long term prepaid expenses and other assets   3.3    4.6 
   $7.8   $12.1