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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Share-Based Compensation Expense Stock-based compensation expense by award type is presented below.
 
Year Ended December 31,
($ in millions)
2019
2018
2017
Restricted stock unit awards
$
61.6

22.4

23.8

Performance stock unit awards
13.6

3.2

—

SAYE
1.2

1.3

1.4

Total
$
76.4

26.9

25.2
Restricted Stock Unit Activity
 
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, 2016
750.9

—

 
750.9

 
$
113.97

 
Granted
188.4

—

 
188.4

 
119.08

 
Vested
(186.5
)
—

 
(186.5
)
 
99.23

 
Forfeited
(25.1
)
—

 
(25.1
)
 
117.07

 
Unvested as of December 31, 2017
727.7

—

 
727.7

 
118.96

1.24
Granted
176.6

100.6

 
277.2

 
156.13

 
Vested
(292.5
)
—

 
(292.5
)
 
125.01

 
Forfeited
(52.2
)
(7.5
)
 
(59.7
)
 
131.84

 
Unvested as of December 31, 2018
559.6

93.1

 
652.7

 
131.32

2.02
Granted
1,298.0

196.5

 
1,494.5

 
141.06

 
Vested
(287.7
)
—

 
(287.7
)
 
116.32

 
Forfeited
(37.6
)
(2.8
)
 
(40.4
)
 
137.49

 
Unvested as of December 31, 2019
1,532.3

286.8

 
1,819.1

 
$
141.51

2.39
UK SAYE Options Granted
Options activity under the SAYE plan is presented in the following table.
 
Year Ended December 31,
(options in thousands)
2019
2018
2017
Options granted
—

—

85

Exercise price - options granted
$
—

$
—

$
90.97

 
 
 
 
Options exercised
17

19

28

Weighted average exercise price
$
160.41

$
142.96

$
121.70