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Software, net (Tables)
 12 Months Ended
Dec. 31, 2017
Research and Development [Abstract]  
Schedule of Capitalized Computer Software
Software, net consisted of the following:     
 
 
As of December 31,
 
 
2017
 
2016
Software
 
$
1,003.2

 
$
924.8

Accumulated amortization
 
(663.8
)
 
(515.7
)
Software, net
 
$
339.4

 
$
409.1
Schedule of Software Amortization Expense
The following reflects intangible amortization expense included within D&A:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Amortization expense
$
260.0

 
$
251.9

 
$
245.5

The following reflects amortization of software included within D&A:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Amortization expense
$
153.3

 
$
158.9

 
$
174.4