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Stockholders' Deficit
 9 Months Ended
Sep. 30, 2018
Compensation Related Costs [Abstract]  
Stockholders' Deficit
Stockholders' Deficit
Stock Based Compensation
The following reflects total stock-based compensation expense recognized under all programs:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2018
 
2017
 
2018
 
2017
Related to stock options
 
$
2.1

 
$
1.1

 
$
10.8

 
$
2.6

Related to RSUs
 
7.3

 
6.4

 
23.0

 
17.9

   Total
 
$
9.4

 
$
7.5

 
$
33.8

 
$
20.5