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Computer Software (Tables)
 6 Months Ended
Jun. 30, 2020
Research and Development [Abstract]  
Schedule of Capitalized Software
Computer software, net consists of the following (in millions):
 
June 30, 2020
 
December 31, 2019
Internally developed software
$
871.0

 
$
808.2

Purchased software
85.9

 
78.9

Computer software
956.9

 
887.1

Accumulated amortization
(532.6
)
 
(481.1
)
Computer software, net
$
424.3

 
$
406.0