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Stock-Based Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Stock-Based Plans |
Summary of restricted stock, restricted stock unit and stock option activity |
|  | Restricted Stock or Restricted Stock Units |  | Stock Options |
|  | Number |  | Weighted Average Grant Date Fair Value Per Share |  | Number |  | Weighted Average Exercise Price Per Share |
Outstanding as of December 31, 2014 |  | 868,521 |  | $ | 66.35 |  | 3,173,008 |  | $ | 62.92 |
Granted |  | 556,323 |  | 58.85 |  | 963,288 |  | 59.05 |
Expired or canceled |  | (30,484 | ) | 64.74 |  | (118,356 | ) | 63.60 |
Vested/exercised |  | (456,052 | ) | 62.92 |  | (46,414 | ) | 38.25 |
Outstanding as of December 31, 2015 |  | 938,308 |  | $ | 63.62 |  | 3,971,526 |  | $ | 62.25 |
Granted |  | 553,415 |  | 46.50 |  | 662,001 |  | 46.07 |
Expired or canceled |  | (16,298 | ) | 54.26 |  | (63,229 | ) | 50.25 |
Vested/exercised |  | (443,062 | ) | 64.55 |  | (88,917 | ) | 41.13 |
Outstanding as of December 31, 2016 |  | 1,032,363 |  | $ | 54.19 |  | 4,481,381 |  | $ | 60.45 |
Granted |  | 402,783 |  | 54.88 |  | 1,103,817 |  | 55.35 |
Expired or canceled |  | (48,005 | ) | 51.58 |  | (285,434 | ) | 63.07 |
Vested/exercised |  | (453,677 | ) | 59.89 |  | (229,808 | ) | 40.82 |
Outstanding as of December 31, 2017 |  | 933,464 |  | $ | 51.85 |  | 5,069,956 |  | $ | 60.08 |
Options exercisable as of December 31, 2017 |  |  |  |  |  | 3,323,462 |  | $ | 63.41 |
Remaining unvested options outstanding and expected to vest |  |  |  |  |  | 1,694,099 |  | $ | 53.75 |
Schedule of fair value on grant date and significant assumptions used in Black-Scholes option-pricing model |
|  | December 31, |
|  | 2017 |  | 2016 |
Weighted average grant date fair value |  | $ | 14.23 |  | $ | 12.55 |
Expected life of options (in years) |  | 5.8 |  | 6.1 |
Risk-free interest rate |  | 2.3 | % | 1.6 | %
Expected volatility |  | 27.8 | % | 32.4 | %
Expected annual dividend per share |  | $ | 0.84 |  | $ | 0.84 |
Summary of information related to options outstanding |
|  | Options Outstanding |  | Options Exercisable |
Range of Exercise Prices |  | Number Outstanding |  | Weighted Average Remaining Contractual Life (In Years) |  | Weighted Average Exercise Price Per Share |  | Number Exercisable |  | Weighted Average Remaining Contractual Life (In Years) |  | Weighted Average Exercise Price Per Share |
$30.46 - $35.00 |  | 76,750 |  | 1.2 |  | $ | 30.46 |  | 76,750 |  | 1.2 |  | $ | 30.46 |
$42.75 - $62.50 |  | 3,940,424 |  | 6.9 |  | 56.53 |  | 2,193,930 |  | 5.6 |  | 58.74 |
$68.36 - $80.12 |  | 1,052,782 |  | 4.6 |  | 75.54 |  | 1,052,782 |  | 4.6 |  | 75.54 |
|  | 5,069,956 |  | 6.3 |  | $ | 60.08 |  | 3,323,462 |  | 5.2 |  | $ | 63.41 |

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- Definition Tabular disclosure for share-based compensation 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 (c)(2) -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 (d) -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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 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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