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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details) $ / shares in Units, AUD in Billions |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 04, 2015 shares | Oct. 24, 2014 USD ($) shares | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment $ / shares shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Jan. 31, 2016 AUD | Dec. 31, 2015 AUD
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 4 |  |  |  |
Number of operating segments | segment |  |  |  | 4 |  |  |  |
Advertising costs from continuing operations |  |  |  | $ 54,600,000 | $ 63,600,000 | $ 65,100,000 |  |
Bad debt expense |  |  |  | 5,000,000 | 2,200,000 | 4,300,000 |  |
Income taxes receivable, current |  |  |  | 54,200,000 | 10,900,000 |  |  |
Depreciation and amortization |  |  |  | 290,900,000 | 268,700,000 | 200,000,000 |  |
Fixed assets, pledged as collateral |  |  |  | 156,400,000 | 117,000,000 |  |  |
Goodwill and intangible asset impairment |  |  |  | 0 | 0 | 0 |  |
Foreign currency transaction loss |  |  |  | 500,000 | 8,800,000 |  |  |
Foreign currency transaction gain |  |  |  |  |  | 2,000,000 |  |
Fair value of debt |  |  |  | 2,100,000,000 | 2,400,000,000 |  |  |
Long term debt carrying amount |  |  |  | 2,100,000,000 | 2,400,000,000 |  |  |
Variable interest entity, maximum exposure to loss |  |  |  | $ 13,800,000 |  |  |  |
Variable interest entity, ownership percentage |  |  |  | 75.00% |  |  |  |
Variable interest entity, initial consolidation, gain (loss) |  |  |  | $ 0 |  |  |  |
Redemption premium |  |  |  | 0 |  |  |  |
Payment of taxes related to settlement of equity awards |  |  |  | 33,500,000 | 27,200,000 | 27,000,000 |  |
Additional paid in capital |  |  |  |  | 35,900,000 | 30,000,000 |  |
Cash provided by operating activities |  |  |  | 816,000,000 | 823,000,000 | 769,100,000 |  |
Cash used in financing activities |  |  |  | (263,700,000) | 1,160,300,000 | (639,000,000) |  |
Impact of Tax Cuts and Jobs Act of 2017 |  |  |  | 50,000,000 |  |  |  |
Additional Paid-In Capital |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Additional paid in capital |  |  |  | $ 26,700,000 | 35,900,000 | 30,000,000 |  |
Income tax benefit adjustment from share-based compensation per diluted common share (in dollars per share) | $ / shares |  |  |  | $ 0.22 |  |  |  |
Accounting Standards Update 2016-09 |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Cash provided by operating activities |  |  |  | $ 26,700,000 |  |  |  |
Cash used in financing activities |  |  |  | (26,700,000) |  |  |  |
Foreign Exchange Option |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Foreign currency option, weighted average strike price |  |  |  |  |  |  | 0.7091 | 0.7225
Derivative, notional amount | AUD |  |  |  |  |  |  | AUD 1.0 | AUD 1.0
Derivative, gain on derivative |  |  |  |  |  | 4,700,000 |  |
Derivative, loss on derivative |  |  | $ 15,400,000 |  |  |  |  |
Property and Equipment |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  | $ 115,600,000 | 88,900,000 | 75,700,000 |  |
Minimum | Computer Software Intangible Asset |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  |  | 3 years |  |  |  |
Maximum | Computer Software Intangible Asset |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  |  | 10 years |  |  |  |
Data Processing Equipment Capitalized Internal Use Software and Systems Costs | Minimum |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  |  | 3 years |  |  |  |
Data Processing Equipment Capitalized Internal Use Software and Systems Costs | Maximum |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  |  | 10 years |  |  |  |
Building |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  |  | 40 years |  |  |  |
Other Capitalized Property Plant and Equipment | Minimum |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  |  | 3 years |  |  |  |
Other Capitalized Property Plant and Equipment | Maximum |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment useful life |  |  |  | 7 years |  |  |  |
Other Current Assets |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Restricted cash |  |  |  | $ 21,400,000 | 28,000,000 |  |  |
Other Current Liabilities |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Restricted cash |  |  |  | 21,400,000 | $ 28,000,000 |  |  |
Cybersecurity Incident |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Insurance settlements receivable |  |  |  | $ 35,000,000 |  |  |  |
Accelerated Share Repurchase Program |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program, settlement (payment) or receipt |  | $ 115,000,000 |  |  |  |  |  |
Treasury stock purchased under share repurchase program (in shares)) | shares | 20,000 | 1,400,000 |  |  |  |  |  |
Treasury stock, holdback provision, percent |  | 10.00% |  |  |  |  |  |
Accelerated share repurchase program, adjustment |  | $ 11,500,000 |  |  |  | $ (11,500,000) |  |
Stock repurchase program, number of shares authorized to be repurchased (in shares) | shares |  | 3,200,000.0 |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive stock options excluded from computation of earnings per share (in shares) | shares |  |  |  | 300,000 | 100,000 | 100,000 |  |
U.S. Information Solutions |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Percentage of revenue from a segment |  |  |  | 37.00% |  |  |  |

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