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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Intrinsic Value of Options Exercised and Fair Value of Options vested
The intrinsic value of options exercised and the fair value of options vested for the periods presented are as follows:
 
 
Twelve Months Ended December 31,
(in millions)
 
2018
 
2017
 
2016
Intrinsic value of options exercised
 
$
134.4

 
$
120.3

 
$
19.4

Total fair value of options vested
 
$
10.3

 
$
14.0

 
$
3.9

2012 Management Equity Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
Stock option activity as of December 31, 2018 and 2017, and for the year ended December 31, 2018, consisted of the following:
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding as of December 31, 2017
5,494,372

 
$
7.42

 
5.4
 
$
261.2

Granted

 

 
 
 
 
Exercised
(2,335,312
)
 
7.11

 
 
 
 
Forfeited
(78,912
)
 
13.59

 
 
 
 
Expired

 

 
 
 
 
Outstanding as of December 31, 2018
3,080,148

 
$
7.49

 
4.4
 
$
151.9

 
 
 
 
 
 
 
 
Expected to vest as of December 31, 2018
220,165

 
$
12.87

 
5.8
 
$
9.7

Exercisable as of December 31, 2018
2,854,770

 
$
7.07

 
4.3
 
$
142.0

2015 Management Equity Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
 
Shares
 
Weighted
Average
Grant Date
Fair Value
 
Weighted
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding as of December 31, 2017
1,990,114

 
$
32.89

 
1.5
 
$
109.4

Granted
904,592

 
64.21

 
 
 
 
Vested
(56,117
)
 
44.07

 
 
 
 
Forfeited
(145,594
)
 
38.90

 
 
 
 
Expired

 

 
 
 
 
Outstanding as of December 31, 2018
2,692,995

 
$
42.86

 
1.1
 
$
153.0

 
 
 
 
 
 
 
 
Expected to vest as of December 31, 2018
3,374,991

 
$
40.93

 
0.9
 
$
191.7

iovation [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
 
Shares
 
Weighted
Average
Grant Date
Fair Value
 
Weighted
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding as of December 31, 2017

 
$

 

 
$

Granted
1,126,090

 
71.66

 
 
 
 
Vested

 

 
 
 
 
Forfeited
(9,769
)
 
71.64

 
 
 
 
Expired

 

 
 
 
 
Outstanding as of December 31, 2018
1,116,321

 
$
71.66

 
2.0

 
$
63.4

 
 
 
 
 
 
 
 
Expected to vest as of December 31, 2018
653,293

 
$
71.66

 
2.0

 
$
37.1