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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Reconciliation of Weighted-Average Outstanding Shares Used in Calculations of Basic and Diluted EPS | A reconciliation of the weighted-average outstanding shares used in the two calculations is as follows:
| Twelve Months Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In millions)
Weighted-average shares outstanding (basic) | 120.1 |  |  | 119.3 |  |  | 118.7 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options and restricted stock units | 1.4 |  |  | 1.8 |  |  | 2.2 |
Weighted-average shares outstanding (diluted) | 121.5 |  |  | 121.1 |  |  | 120.9 |
Useful Life of Other Purchased Intangible Assets | All of our other purchased intangible assets are also amortized on a straight-line basis.
Asset |  | Useful Life
|  | (In years)
Purchased data files |  | 2 to 15
Acquired software and technology |  | 1 to 10
Non-compete agreements |  | 1 to 5
Proprietary database |  | 6 to 10
Customer relationships |  | 2 to 25
Trade names |  | 1 to 15
Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table presents assets and liabilities measured at fair value on a recurring basis:
|  |  |  |  |  | Fair Value Measurements at Reporting Date Using:
Description |  |  | Fair Value at December 31, 2017 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
|  |  | (In millions)
Assets and Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation Plan Assets | (1) |  | $ | 35.5 |  |  | $ | 35.5 |  |  | $ | — |  |  | $ | — |
Deferred Compensation Plan Liability | (1) |  | (35.5 | ) |  | — |  |  | (35.5 | ) |  | — |
Total assets and liabilities |  |  | $ | — |  |  | $ | 35.5 |  |  | $ | (35.5 | ) |  | $ | — |
(1) | We maintain deferred compensation plans that allow for certain management employees to defer the receipt of compensation (such as salary, incentive compensation and commissions) until a later date based on the terms of the plans. The liability representing benefits accrued for plan participants is valued at the quoted market prices of the participants’ investment elections. The asset consists of mutual funds reflective of the participants investment selections and is valued at daily quoted market prices.

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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