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Software, net
 9 Months Ended
Sep. 30, 2018
Capitalized Computer Software, Net [Abstract]  
Software, net
Software, net
Software, net consisted of the following:
 
 
September 30, 2018
 
December 31, 2017
Software
 
$
1,083.0

 
$
1,003.2

Accumulated amortization
 
(781.8
)
 
(663.8
)
Software, net
 
$
301.2

 
$
339.4


The following reflects amortization of software included within D&A:
 
 
Three Months Ended

Nine Months Ended
 
 
September 30,

September 30,
 
 
2018

2017

2018

2017
Amortization expense
 
$
42.2

 
$
41.8

 
$
123.5

 
$
114.2