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Equity Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity Incentive Plans [Abstract] |
Assumptions used to determine the fair value of options granted |
Option grant assumptions
|  | 2017 |  | 2016 |  | 2015
Weighted average expected term |  | 6.1 years |  |  | 5.0 years |  |  | 6.5 years |
Expected volatility |  | 15.7 - 32.7% |  |  | 16.0 - 34.3% |  |  | 16.0 - 37.8% |
Weighted average volatility |  | 21.0 | % |  | 24.3 | % |  | 24.7 | %
Expected dividends |  | 1.4 - 1.9% |  |  | 1.9 - 2.1% |  |  | 1.6 - 2.1% |
Weighted average expected dividends |  | 1.9 | % |  | 2.1 | % |  | 1.7 | %
Risk-free rate |  | 0.5 - 2.5% |  |  | 0.2 - 2.4% |  |  | 0.0 - 2.4% |
Summary of option activity |
Summary of option activity
|  | For the year ended December 31, 2017
|  | Number (in 000s) |  | Weighted average exercise price |  | Aggregate intrinsic value (in 000s) |  | Weighted average remaining contractual term (years)
Outstanding as of January 1, 2017 |  | 13,560 |  |  | $ | 50.01 |  |  |  |  |
Granted |  | 2,631 |  |  | 78.93 |  |  |  |  |
Exercised |  | (4,688 | ) |  | 44.91 |  |  |  |  |
Forfeited |  | (229 | ) |  | 70.85 |  |  |  |  |
Expired |  | (12 | ) |  | 59.91 |  |  |  |  |
Outstanding as of December 31, 2017 |  | 11,262 |  |  | 58.46 |  |  | $ | 520,900 |  |  | 6.5
Outstanding, net of expected forfeitures |  | 11,140 |  |  | 58.27 |  |  | 517,276 |  |  | 6.5
Outstanding, exercisable (“vested”) |  | 6,314 |  |  | 47.83 |  |  | 359,121 |  |  | 5.1
Changes in restricted stock units |
Changes in restricted stock units
|  | For the year ended December 31, 2017
|  | Number (in 000s) |  | Weighted average grant date fair value
Nonvested as of January 1, 2017 |  | 1,679 |  |  | $ | 58.49 |
Granted |  | 333 |  |  | 80.12 |
Vested |  | (718 | ) |  | 51.42 |
Forfeited |  | (53 | ) |  | 69.19 |
Nonvested as of December 31, 2017 |  | 1,241 |  |  | 67.93 |
Changes in performance stock units |
Changes in performance stock awards
|  | For the year ended December 31, 2017
|  | Number (in 000s) |  | Weighted average grant date fair value
Nonvested as of January 1, 2017 |  | 919 |  |  | $ | 61.50 |
Granted |  | 458 |  |  | 78.47 |
Adjustment for performance achievement |  | (33 | ) |  | 52.75 |
Vested |  | (213 | ) |  | 52.52 |
Forfeited |  | (41 | ) |  | 69.30 |
Nonvested as of December 31, 2017 |  | 1,090 |  |  | 70.35 |

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- Definition Equity Incentive Plans [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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 + 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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- 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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