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Software, net
 6 Months Ended
Jun. 30, 2017
Capitalized Computer Software, Net [Abstract]  
Software, net
Software, net
Software, net consisted of the following:
    
 
 
June 30, 2017
 
December 31, 2016
Software
 
$
970.1

 
$
924.8

 Accumulated amortization
 
(591.4
)
 
(515.7
)
Software, net
 
$
378.7

 
$
409.1


The following reflects amortization of software included within D&A:
 
Three Months Ended
 
Six Months Ended
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
Amortization expense
$
36.1

 
$
44.1

 
$
72.4

 
$
78.5