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Computer Software (Tables)
 9 Months Ended
Sep. 30, 2020
Research and Development [Abstract]  
Schedule of Capitalized Software
Computer software, net consists of the following (in millions):
 September 30, 2020December 31, 2019
Internally developed software$976.4 $808.2 
Purchased software85.9 78.9 
Computer software1,062.3 887.1 
Accumulated amortization(559.3)(481.1)
Computer software, net$503.0 $406.0