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Equity, Stock Option and Restricted Shares (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
2000 Employee Option Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Options exercisable period | 10 years |  |  |
2009 Employee Option Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Number of additional stock options that will be granted (in shares) | 0 |  |  |
Options ratable vesting period | 5 years |  |  |
Options exercisable period | 10 years |  |  |
2017 Employee Option Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Common Stock reserved for issuance | 30,000,000 |  |  |
Shares available for the granting of additional stock options | 22,991,400 |  |  |
Options ratable vesting period | 5 years |  |  |
Options exercisable period | 10 years |  |  |
2004 Directors Option Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Options exercisable period | 10 years |  |  |
Stock Options |  |  |  |
Stock option activity |  |  |  |
Options outstanding at the beginning of the period (in shares) | 32,266,391 | 31,136,475 | 27,787,920 |
Options granted (in shares) | 7,029,600 | 7,560,450 | 6,490,200 |
Options exercised (in shares) | (5,773,287) | (5,703,254) | (2,718,745) |
Options forfeited (in shares) | (300,340) | (727,280) | (422,900) |
Options outstanding at the end of the period (in shares) | 33,222,364 | 32,266,391 | 31,136,475 | 27,787,920
Vested and non-vested options expected to vest at the end of the period (in shares) | 31,214,883 |  |  |
Exercisable at the end of the period (in shares) | 13,621,924 |  |  |
Weighted Average Exercise Price |  |  |  |
Weighted average exercise price, options outstanding at the beginning of the period (in dollars per share) | $ 44.14 | $ 37.62 | $ 31.60 |
Weighted average exercise price, options granted (in dollars per share) | 72.98 | 57.72 | 57.85 |
Weighted average exercise price, options exercised (in dollars per share) | 31.87 | 25.80 | 23.71 |
Weighted average exercise price, options forfeited (in dollars per share) | 55.16 | 50.17 | 41.73 |
Weighted average exercise price, options outstanding at the end of the period (in dollars per share) | 52.27 | $ 44.14 | $ 37.62 | $ 31.60
Weighted average exercise price, vested and non-vested options expected to vest (in dollars per share) | 51.61 |  |  |
Weighted average exercise price, exercisable (in dollars per share) | $ 39.48 |  |  |
Weighted Average Remaining Contractual Term |  |  |  |
Weighted average remaining contractual term of options outstanding | 7 years 18 days | 7 years 11 days | 6 years 11 months 1 day | 7 years 1 month 2 days
Weighted average remaining contractual term of options vested options and non-vested expected to vest | 6 years 11 months 16 days |  |  |
Weighted average remaining contractual term of options exercisable | 5 years 4 months 24 days |  |  |
Aggregate Intrinsic Value |  |  |  |
Aggregate intrinsic value of options outstanding | $ 1,180.3 |  |  |
Aggregate intrinsic value of options, vested and non-vested options expected to vest | 1,129.8 |  |  |
Aggregate intrinsic value of options exercisable | $ 658.2 |  |  |
Status of the Company's non-vested options and changes during the year |  |  |  |
Non-vested options at the beginning of the period (in shares) | 18,725,570 |  |  |
Options granted (in shares) | 7,029,600 | 7,560,450 | 6,490,200 |
Non-vested options, options vested (in shares) | (5,854,390) |  |  |
Non-vested options, options forfeited (in shares) | (300,340) |  |  |
Non-vested options at the end of the period (in shares) | 19,600,440 | 18,725,570 |  |
Weighted Average Fair Value at Grant Date |  |  |  |
Weighted average fair value at the grant date, options outstanding at the beginning of the period (in dollars per share) | $ 7.99 |  |  |
Weighted average fair value at grant date, options granted (in dollars per share) | 8.78 | $ 7.39 | $ 8.47 |
Weighted average fair value at grant date, options vested (in dollars per share) | 7.91 |  |  |
Weighted average fair value at grant date, options forfeited (in dollars per share) | 8.10 |  |  |
Weighted average fair value at the grant date, options outstanding at the end of the period (in dollars per share) | $ 8.29 | $ 7.99 |  |
Fair Value at Grant Date |  |  |  |
Total intrinsic value of stock options exercised (in dollars) | $ 268.7 | $ 197.2 | $ 88.1 |
Total fair value of stock options vested (in dollars) | 46.3 | $ 43.1 | $ 39.9 |
Total compensation cost related to non-vested options not yet recognized (in dollars) | $ 120.3 |  |  |
Weighted average expected amortization period | 3 years 3 months 18 days |  |  |
Restricted Shares | 2012 Directors Restricted Stock Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Shares available for the granting of additional stock options | 124,164 |  |  |
Restricted share activity |  |  |  |
Restricted shares outstanding at the beginning of the period (in shares) | 16,905 | 17,256 | 18,340 |
Restricted shares granted (in shares) | 12,905 | 16,905 | 17,948 |
Shares vested and issued (in shares) | (16,905) | (17,256) | (19,032) |
Restricted shares outstanding at the end of the period (in shares) | 12,905 | 16,905 | 17,256 | 18,340
Fair Value at Grant Date |  |  |  |
Fair value at the grant date, restricted shares outstanding at the beginning of the period (in dollars per share) | $ 57.99 | $ 57.97 | $ 47.72 |
Fair value of restricted shares vested and issued (in dollar per share) | 57.99 | 57.97 | 47.98 |
Fair value of restricted shares granted (in dollars per share) | 73.25 | 57.99 | 57.85 |
Fair value at the grant date, restricted shares outstanding at the end of the period (in dollars per share) | $ 73.25 | $ 57.99 | $ 57.97 | $ 47.72
Weighted Average Remaining Amortization Term (in years) | 4 months 13 days | 4 months 17 days | 4 months 21 days | 4 months 21 days
Total fair value of restricted share awards vested (in dollars) | $ 1.0 | $ 1.0 | $ 0.9 |
Total compensation cost related to non-vested restricted shares not yet recognized (in dollars) | $ 0.4 |  |  |
Weighted average expected amortization period | 4 months 13 days |  |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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