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Net Income Per Common Share (Details) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Net Income Per Common Share |  |
Weighted average shares used for the basic net income per share computation | 225,346,407 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 207,003,950 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental shares from share-based compensation | 162,425 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 3,391 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average shares used for diluted net income per share computation | 225,825,854 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 207,324,363 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Unvested Shares |  |
Net Income Per Common Share |  |
Unvested shares from share-based compensation that were anti-dilutive | 111,338 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = o_UnvestedSharesMember | 194,933 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = o_UnvestedSharesMember
Convertible Partnership Units |  |
Net Income Per Common Share |  |
Weighted average partnership common units convertible to common shares that were dilutive | 317,022 o_IncrementalCommonSharesAttributableToBusinessAcquisition / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = o_ConvertiblePartnershipUnitsMember | 317,022 o_IncrementalCommonSharesAttributableToBusinessAcquisition / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = o_ConvertiblePartnershipUnitsMember
Unvested shares from share-based compensation that were anti-dilutive | 440,546 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = o_ConvertiblePartnershipUnitsMember | 534,546 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = o_ConvertiblePartnershipUnitsMember

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + 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 -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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