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Earnout Liability (Tables)
12 Months Ended
Dec. 31, 2019
Earnout Liability [Abstract]  
Schedule of earnout liability measured using significant unobservable inputs (Level 3)
   (in millions) 
Balance – October 1, 2017  $16.7 
Change in fair value of earnout liability   (8.7)
Balance – September 30, 2018  $8.0 
      
Balance – January 1, 2019  $6.3 
Change in fair value of earnout liability   2.3 
Settlement of earnout liability   (8.6)
Balance – December 31, 2019  $