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Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Restricted Stock Unit Activity
Restricted stock unit ("RSU") and performance stock unit ("PSU") awards activity is presented in the following tables.
 
RSU Shares
(in 000's)
PSU Shares
(in 000's)
 
Total Shares
(in 000's)
 
Weighted Average
Grant Date
Fair Value
Weighted Average
Remaining
Contractual Life
(in years)
Unvested as of June 30, 2020
1,343.2

558.8

 
1,902.0

 
$
137.93

2.01
Granted
11.2

4.4

 
15.6

 
107.51

 
Vested
(213.5
)
—

 
(213.5
)
 
140.38

 
Forfeited
(13.0
)
(4.5
)
 
(17.5
)
 
134.03

 
Unvested as of September 30, 2020
1,127.9

558.7

 
1,686.6

 
$
137.49

1.85
 
 
 
 
 
 
 
 
Unvested as of June 30, 2019
436.7

259.6

 
696.3

 
$
144.17

2.25
Granted
1,130.1

—

 
1,130.1

 
141.14

 
Vested
(45.8
)
—

 
(45.8
)
 
122.48

 
Forfeited
(8.1
)
—

 
(8.1
)
 
138.96

 
Unvested as of September 30, 2019
1,512.9

259.6

 
1,772.5

 
$
142.82

2.59
 
RSU Shares
(in 000's)
PSU Shares
(in 000's)
 
Total Shares
(in 000's)
 
Weighted Average
Grant Date
Fair Value
Weighted Average
Remaining
Contractual Life
(in years)
Unvested as of December 31, 2019
1,532.3

286.8

 
1,819.1

 
$
141.51

2.39
Granted
173.1

276.4

 
449.5

 
114.19

 
Vested
(548.4
)
—

 
(548.4
)
 
137.92

 
Forfeited
(29.1
)
(4.5
)
 
(33.6
)
 
136.96

 
Unvested as of September 30, 2020
1,127.9

558.7

 
1,686.6

 
$
137.49

1.85
 
 
 
 
 
 
 
 
Unvested as of December 31, 2018
559.6

93.1

 
652.7

 
$
131.32

2.02
Granted
1,243.4

166.9

 
1,410.3

 
149.22

 
Vested
(268.3
)
—

 
(268.3
)
 
116.25

 
Forfeited
(21.8
)
(0.4
)
 
(22.2
)
 
134.54

 
Unvested as of September 30, 2019
1,512.9

259.6

 
1,772.5

 
$
142.82

2.59