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Software, net
 9 Months Ended
Sep. 30, 2017
Capitalized Computer Software, Net [Abstract]  
Software, net
Software, net
Software, net consisted of the following:
    
 
 
September 30, 2017
 
December 31, 2016
Software
 
$
989.2

 
$
924.8

 Accumulated amortization
 
(632.5
)
 
(515.7
)
Software, net
 
$
356.7

 
$
409.1


The following reflects amortization of software included within D&A:
 
Three Months Ended
 
Nine Months Ended
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
Amortization expense
$
41.8

 
$
44.2

 
$
114.2

 
$
122.6