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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation Expense
Stock-based compensation expense consisted of the following.
 
Year Ended December 31,
($ in millions)
2018
2017
2016
Stock unit awards
$
25.6

23.8

25.5

SAYE
1.3

1.4

1.4

Total
$
26.9

25.2

26.9
Restricted Stock Unit Activity
RSU and PSU activity is presented in the below table.
 
Shares
(in thousands)
 
Weighted Average
Grant Date
Fair Value
Weighted Average
Remaining
Contractual Life (in years)
Unvested as of December 31, 2015
706.0

 
$
111.78

 
Granted
299.3

 
107.74

 
Vested
(203.6
)
 
96.37

 
Forfeited
(50.8
)
 
117.48

 
Unvested as of December 31, 2016
750.9

 
113.97

1.71
Granted
188.4

 
119.08

 
Vested
(186.5
)
 
99.23

 
Forfeited
(25.1
)
 
117.07

 
Unvested as of December 31, 2017
727.7

 
118.96

1.24
Granted
277.2

 
156.13

 
Vested
(292.5
)
 
125.01

 
Forfeited
(59.7
)
 
131.84

 
Unvested as of December 31, 2018
652.7

 
$
131.32

2.02
UK SAYE Options Granted
Options activity under the SAYE plan is presented in the following table.
 
Year Ended December 31,
(options in thousands)
2018
2017
2016
Options granted
—

85

—

Exercise price - options granted
$
—

$
90.97

$
—

 
 
 
 
Options exercised
19

28

20

Weighted average exercise price
$
142.96

$
121.70

$
70.37