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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Schedule of Changes in Option Shares | Changes in option shares, all of which are Common Stock, were as follows:
|  | Weighted-Avg. Per Share Exercise Price |  |  | Years Ended December 31 |  |  | (dollars in millions) Aggregate Intrinsic Value |
|  |  | 2017 |  |  | 2016 |  |  | 2015 |  |
Outstanding at beginning of year |  | $ | 21.69 |  |  |  | 2,664,333 |  |  |  | 2,653,558 |  |  |  | 3,154,006 |  |  |  |  |
Granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017—$50.16 to $50.16 per share |  |  |  |  |  |  | 358,150 |  |  |  |  |  |  |  |  |  |  |  |  |
2016—$31.49 to $46.93 per share |  |  |  |  |  |  |  |  |  |  | 553,370 |  |  |  |  |  |  |  |  |
2015—$23.24 to $25.34 per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 484,990 |  |  |  |  |
Exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017—$4.75 to $31.67 per share |  |  |  |  |  |  | (752,603 | ) |  |  |  |  |  |  |  |  |  | $ | 12.7 |
2016—$4.75 to $30.77 per share |  |  |  |  |  |  |  |  |  |  | (531,933 | ) |  |  |  |  |  |  | 7.5 |
2015—$4.10 to $17.46 per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (978,208 | ) |  |  | 10.2 |
Forfeited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017—$30.77 to $50.16 per share |  |  |  |  |  |  | (6,754 | ) |  |  |  |  |  |  |  |  |  |  |  |
2016—$23.24 to $46.93 per share |  |  |  |  |  |  |  |  |  |  | (10,662 | ) |  |  |  |  |  |  |  |
2015—$17.46 to $23.24 per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,230 | ) |  |  |  |
Outstanding at end of year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(2017—$4.75 to $50.16 per share) |  |  | 27.73 |  |  |  | 2,263,126 |  |  |  | 2,664,333 |  |  |  | 2,653,558 |  |  |  |  |
Exercisable at end of year |  |  | 20.48 |  |  |  | 1,387,259 |  |  |  | 1,602,651 |  |  |  | 1,544,186 |  |  |  |  |
Schedule of Weighted Average Information by Range of Exercise Prices for Stock Options Outstanding and Exercisable | The following table summarizes weighted-average information by range of exercise prices for stock options outstanding and exercisable at December 31, 2017:
Range of Exercise Prices |  | Options Outstanding at December 31, 2017 |  |  | Weighted- Average Exercise Price |  |  | Options Exercisable at December 31, 2017 |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life |
$4.75 to $11.50 |  |  | 414,134 |  |  | $ | 9.56 |  |  |  | 414,134 |  |  | $ | 9.56 |  |  |  | 4 years |
$17.46 to $25.34 |  |  | 556,847 |  |  |  | 20.58 |  |  |  | 556,847 |  |  |  | 20.58 |  |  |  | 7 years |
$26.47 to $50.16 |  |  | 1,292,145 |  |  |  | 36.63 |  |  |  | 416,278 |  |  |  | 31.20 |  |  |  | 8 years |
|  |  | 2,263,126 |  |  |  |  |  |  |  | 1,387,259 |  |  |  |  |  |  |  |  |
Schedule of Weighted Average Fair Value per Option at Date of Grant | The weighted-average fair value per option at the date of grant during 2017, 2016 and 2015, using the Black-Scholes option-pricing model, was $13.04, $8.03 and $8.59, respectively. Assumptions were as follows:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Expected life (years) |  |  | 5.7 |  |  |  | 5.8 |  |  |  | 5.9 |
Risk-free interest rate |  |  | 2.4 | % |  |  | 1.7 | % |  |  | 2.0 | %
Dividend yield |  |  | 1.0 | % |  |  | 1.3 | % |  |  | 1.0 | %
Expected volatility |  |  | 26.5 | % |  |  | 27.7 | % |  |  | 29.3 | %
Schedule of Share Unit Activity Under Plan | A summary of share unit activity under the plan is as follows:
|  | Number of Units |  |  | Weighted-Average Grant Date Value |
Outstanding at January 1, 2017 |  |  | 544,055 |  |  | $ | 27.35 |
Granted |  |  | 107,853 |  |  |  | 50.17 |
Vested |  |  | (213,863 | ) |  |  | 23.25 |
Forfeited/cancelled |  |  | (4,755 | ) |  |  | 34.25 |
Outstanding at December 31, 2017 |  |  | 433,290 |  |  |  | 34.96 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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