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Stockholders' Deficit and Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [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,
2017
 
2016
 
2017
 
2016
Related to vesting of stock options
$
1.3

 
$
0.6

 
$
1.5

 
$
1.3

Related to vesting of RSUs
5.8

 
5.4

 
11.5

 
11.2

   Total
$
7.1

 
$
6.0

 
$
13.0

 
$
12.5