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Share-Based Payments | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Shared-Based Payments | Expense Recognition The following table provides share-based compensation expense in 2015, 2014, and 2013:
($ in millions) | 2015 |  | 2014 |  | 2013
Share-based compensation expense, pre-tax | $ | 23.8 |  |  | 18.6 |  |  | 19.9 |
Income tax benefit | (8.0 | ) |  | (6.2 | ) |  | (6.8 | )
Share-based compensation expense, after-tax | $ | 15.8 |  |  | 12.4 |  |  | 13.1 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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=6415400&loc=d3e5070-113901 + Details
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