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Shares and Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Reconciliation of the denominator (number of shares) in the calculations of basic and diluted earnings (loss) per common share |  |  |
Weighted-average shares, as used in basic calculation |  | 225,619,803 | 241,676,363
Shares to cover exercise of outstanding warrants |  | 1,023,429 | 1,101,947
Shares to cover non-vested stock | [1] | 1,675,799 | 1,063,150
Average stock options outstanding during the period |  | 2,681,129 | 1,806,644
Assumed acquisition of shares with assumed proceeds from exercising outstanding warrants |  | (150,236) | (291,520)
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period) | [1] | (1,619,156) | (1,299,510)
Shares repurchaseable from measured but unrecognized stock option expense |  | (77,078) | (1,103)
Average deferred compensation shares |  | 949,815 | 1,039,929
Weighted-average shares, as used in diluted calculation | [1] | 230,103,505 | 245,095,900
[1] | Effective October 1, 2016, we early adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting. We have updated certain previously reported interim results and metrics as of January 1, 2016, in accordance with the new guidance. For more information, see Note 1 - Earnings Per Share in our 2016 Form 10-K.

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- Definition The sum of the amount the employee must pay upon exercise and the amount of tax benefits that would be credited to additional paid-in capital assuming exercise of the options shall be assumed to be used to purchase common stock at the average market price during the period. The tax benefit is the amount resulting from a tax deduction for compensation in excess of compensation expense recognized for financial reporting purposes. + References No definition available. + Details
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- Definition Exercise of CPP warrant shall be assumed at the beginning of the period (or at time of issuance, if later) and common shares shall be assumed to be issued. The proceeds from exercise are assumed to be used to purchase common stock at the average market price during the period. The incremental shares (the difference between the number of shares assumed issued and the number of shares assumed purchased) shall be included in the denominator of the diluted EPS computation. + References No definition available. + Details
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- Definition The deferred compensation plans allow participants to invest in LNC stock. The weighted average number of deferred compensation shares to be included in earnings per share calculations is calculated using an arithmetical mean of our deferred compensation shares outstanding during the period. + References No definition available. + Details
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- Definition Aggregate awards of share options to be issued to an employee under a share-based compensation arrangement. Such awards shall be considered outstanding as of the grant date for purposes of computing diluted EPS even though their exercise may be contingent upon vesting. Those awards are included in the diluted EPS computation even if the employee may not receive (or be able to sell) the stock until some future date. + References No definition available. + Details
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- Definition The amount of compensation cost attributed to future services and not yet recognized shall be assumed to be used to purchase common stock at the average market price during the period. + References No definition available. + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1757-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Treasury Stock Method -URI http://asc.fasb.org/extlink&oid=6527216 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Call Option -URI http://asc.fasb.org/extlink&oid=6506649 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Warrant -URI http://asc.fasb.org/extlink&oid=6528364 + Details
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- Definition Nonvested equity-based payment awards that contain forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) that result in incremental common shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 68B -URI http://asc.fasb.org/extlink&oid=64863997&loc=SL5498026-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1500-109256 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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