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Stockholders' Deficit (Tables)
 6 Months Ended
Jun. 30, 2018
Compensation Related Costs [Abstract]  
Schedule of Stock-based Compensation Expense Recognized
The following reflects total stock-based compensation expense recognized under all programs:
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2018
 
2017
 
2018
 
2017
Related to stock options
 
$
7.3

 
$
1.3

 
$
8.7

 
$
1.5

Related to RSUs
 
8.3

 
5.8

 
15.7

 
11.5

   Total
 
$
15.6

 
$
7.1

 
$
24.4

 
$
13.0