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Stock-Based Compensation, Options and Restricted Shares (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
2000 Employee Option Plan |  |  |
Stock-Based Compensation |  |  |
Number of additional stock options that can be granted (in shares) | 0 |  |
Options exercisable period | 10 years |  |
2009 Employee Option Plan |  |  |
Stock-Based Compensation |  |  |
Common Stock reserved for issuance | 58,000,000 |  |
Shares available for the granting of additional stock options | 12,123,770 |  |
Options exercisable period | 10 years |  |
Options ratable vesting period | 5 years |  |
2004 Directors Option Plan |  |  |
Stock-Based Compensation |  |  |
Shares available for the granting of additional stock options | 140,000 |  |
Options exercisable period | 10 years |  |
Number of additional stock options expected to be granted (in shares) | 0 |  |
Stock Options |  |  |
Stock option activity |  |  |
Options outstanding at the beginning of the period (in shares) | 32,266,391 |  |
Options exercised (in shares) | (834,925) |  |
Options forfeited (in shares) | (45,660) |  |
Options outstanding at the end of the period (in shares) | 31,385,806 |  | 32,266,391
Vested and non-vested options expected to vest at the end of the period (in shares) | 29,778,073 |  |
Exercisable at the end of the period (in shares) | 12,788,636 |  |
Weighted Average Exercise Price |  |  |
Weighted average exercise price, options outstanding at the beginning of the period (in dollars per share) | $ 44.14 |  |
Weighted average exercise price, options outstanding at the end of the period (in dollars per share) | 44.54 |  | $ 44.14
Weighted average exercise price, vested and non-vested options expected to vest (in dollars per share) | 44.04 |  |
Weighted average exercise price, exercisable (in dollars per share) | $ 33.31 |  |
Weighted Average Remaining Contractual Term |  |  |
Weighted average remaining contractual term of options outstanding | 6 years 10 months 6 days |  | 7 years 11 days
Weighted average remaining contractual term of options vested options and non-vested expected to vest | 6 years 9 months 11 days |  |
Weighted average remaining contractual term of options exercisable | 5 years 2 months 12 days |  |
Aggregate Intrinsic Value |  |  |
Aggregate intrinsic value of options outstanding | $ 835.7 |  | $ 744.1
Aggregate intrinsic value of options, vested and non-vested options expected to vest | 807.9 |  |
Aggregate intrinsic value of options exercisable | $ 484.2 |  |
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 |  |
Non-vested options, options vested (in shares) | (82,740) |  |
Non-vested options, options forfeited (in shares) | (45,660) |  |
Non-vested options at the end of the period (in shares) | 18,597,170 |  | 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 vested (in dollars per share) | 8.17 |  |
Weighted average fair value at grant date, options forfeited (in dollars per share) | 7.84 |  |
Weighted average fair value at the grant date, options outstanding at the end of the period (in dollars per share) | $ 7.98 |  | $ 7.99
Fair Value at Grant Date |  |  |
Total intrinsic value of stock options exercised | $ 34.5 | $ 20.7 |
Total fair value of stock options vested | 0.7 | $ 0.4 |
Total compensation cost related to non-vested options not yet recognized | $ 101.9 |  |
Weighted average expected amortization period | 3 years 1 month 17 days |  |
Restricted Shares | 2012 Directors Restricted Stock Plan |  |  |
Stock-Based Compensation |  |  |
Shares available for the granting of additional stock options | 137,069 |  |
Restricted share activity |  |  |
Restricted shares outstanding at the beginning of the period (in shares) | 16,905 |  |
Restricted shares outstanding at the end of the period (in shares) | 16,905 |  | 16,905
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 |  |
Fair value at the grant date, restricted shares outstanding at the end of the period (in dollars per share) | $ 57.99 |  | $ 57.99
Weighted Average Remaining Amortization Term (in years) | 1 month 17 days |  | 4 months 17 days
Total compensation cost related to non-vested restricted shares not yet recognized | $ 0.1 |  |
Weighted average expected amortization period | 1 month 17 days |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + 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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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=6415400&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=6415400&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=6415400&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=6415400&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 fully vested and expected to vest 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 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options outstanding, 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=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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