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Software Development Costs, Net (Tables)
12 Months Ended
Dec. 31, 2019
Research and Development [Abstract]  
Schedule of software development costs, net

   December 31,
2019
   September 30,
2018
 
   (in millions) 
Software development costs  $129.9   $100.9 
Less: accumulated amortization   (83.0)   (60.9)
   $46.9   $40.0 
Schedule of estimated software amortization expense

Year ending December 31, (in millions)    
2020  $19.2 
2021   14.4 
2022   7.6 
2023   3.5 
2024   2.0 
Thereafter   0.2 
Total  $46.9