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Software Development Costs, Net
12 Months Ended
Dec. 31, 2019
Research and Development [Abstract]  
Software Development Costs, net
7.Software Development Costs, net

 

Software development costs, net consisted of the following:

 

   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 

 

During the year ended December 31, 2019, the three months ended December 31, 2018 and the year ended September 30, 2018, the Company capitalized $23.5 million, $3.6 million and $17.7 million of software development costs, respectively. Amounts in the above table include $0.9 million and $1.3 million of internal use software at December 31, 2019 and September 30, 2018, respectively.

 

The total amount of software costs amortized was $16.4 million, $3.9 million and $18.1 million for the year ended December 31, 2019, the three months ended December 31, 2018 and the year ended September 30, 2018, respectively. Software costs written down to net realizable value amounted to $0.4 million, $0.0 million and $5.4 million for the year ended December 31, 2019, the three months ended December 31, 2018 and the year ended September 30, 2018, respectively. The $5.4 million for the year ended September 30, 2018 includes $0.5 million recorded as amortization expense incurred during the normal course of business and $4.9 million recorded as a one-time impairment expense. The weighted average amortization period was 3.0 years, 3.1 years and 3.1 years for the year ended December 31, 2019, the three months ended December 31, 2018 and the year ended September 30, 2018, respectively.

 

The estimated software amortization expense for the years ending December 31 are as follows:

 

 

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