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

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- Definition Schedule of Share-based Compensation, Restricted and Performance Stock Units Award Activity [Table Text Block] + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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