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Stock-Based Compensation (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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