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QUARTERLY FINANCIAL DATA (UNAUDITED) (Additional Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Data [Line Items] |  |  |
Tax Cuts and Jobs Act of 2017, income tax benefit | $ 48.3 |  |
Veda |  |  |
Quarterly Financial Data [Line Items] |  |  |
Acquisition related amounts |  |  | $ 40.2
Acquisition related amounts, net of tax |  |  | 28.2
Cybersecurity Incident, Investigation, Remediation, Legal, And Other Professional Services |  |  |
Quarterly Financial Data [Line Items] |  |  |
Loss contingency, loss in period, net |  | $ 114.0 |
Loss contingency, loss in period |  | 113.3 |
Selling, general and administrative expenses | Cybersecurity Incident, Investigation, Remediation, Legal, And Other Professional Services |  |  |
Quarterly Financial Data [Line Items] |  |  |
Loss contingency, loss in period, net |  | 99.8 |
Loss contingency, loss in period |  | 99.1 |
Cost of services | Cybersecurity Incident, Investigation, Remediation, Legal, And Other Professional Services |  |  |
Quarterly Financial Data [Line Items] |  |  |
Loss contingency, loss in period |  | $ 14.2 |
Operating Income | Veda |  |  |
Quarterly Financial Data [Line Items] |  |  |
Acquisition related amounts |  |  | 30.1
Other Income | Veda |  |  |
Quarterly Financial Data [Line Items] |  |  |
Acquisition related amounts |  |  | 9.2
Interest Expense | Veda |  |  |
Quarterly Financial Data [Line Items] |  |  |
Acquisition related amounts |  |  | $ 0.7

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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