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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation Expense
Stock-based compensation expense is included within Compensation and benefits expense on the Consolidated Statements of Comprehensive Income. Stock-based compensation expense consisted of the following.
 
Year Ended December 31,
($ in millions)
2017
2016
2015
Restricted stock unit awards
$
23.8

25.5

20.7

SAYE
1.4

1.4

2.1

Total
$
25.2

26.9

22.8
Restricted Stock Unit Activity
Restricted stock unit 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, 2014
745.3

 
$
90.43

 
Granted
186.3

 
159.30

 
Vested
(196.4
)
 
78.45

 
Forfeited
(29.2
)
 
94.20

 
Unvested as of December 31, 2015
706.0

 
111.78

2.03
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
UK SAYE Options Granted
Options activity under the SAYE plan is presented in the following table.
 
Year Ended December 31,
(options in thousands)
2017
 
2016
Options granted
85

 
—

Exercise price - options granted
$
90.97

 
$
—

 
 
 
 
Options exercised
28

 
20

Weighted average exercise price
$
121.70

 
$
70.37