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Earnout Liability (Tables)
6 Months Ended
Jun. 30, 2019
Earnout Liability [Abstract]  
Schedule of earnout liability measured using significant unobservable inputs (Level 3)
   (in millions) 
Balance – September 30, 2018  $8.0 
Change in fair value of earnout liability   0.6 
Settlement of earnout liability   (8.6)
Balance – June 30, 2019  $