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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) shares in Millions, $ in Billions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) segment shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) 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 |  |  |  |
Contract assets |  | $ 7,300,000 |  |  |  |
Contract liability |  | 0 |  |  |  |
Advertising costs from continuing operations |  | 43,100,000 | $ 54,600,000 | $ 63,600,000 |  |
Bad debt expense |  | 5,600,000 | 5,000,000 | 2,200,000 |  |
Depreciation and amortization |  | 315,900,000 | 290,900,000 | 268,700,000 |  |
Fixed assets, pledged as collateral |  | 156,400,000 | 156,400,000 |  |  |
Goodwill and intangible asset impairment |  | 0 | 0 | 0 |  |
Foreign currency transaction loss |  | 1,600,000 | 500,000 | 8,800,000 |  |
Fair value of debt |  | 2,600,000,000 | 2,100,000,000 |  |  |
Long term debt carrying amount |  | 2,600,000,000 | 2,100,000,000 |  |  |
Variable interest entity, maximum exposure to loss |  | $ 16,400,000 |  |  |  |
Variable interest entity, ownership percentage |  | 75.00% |  |  |  |
Redemption premium |  | $ 0 |  |  |  |
Impact of Tax Cuts and Jobs Act of 2017 |  |  | 0 |  |  |
Selling, general and administrative expenses |  | (1,213,300,000) | (1,032,000,000) | (941,000,000) |  |
Other income (expense), net |  | 11,800,000 | 7,700,000 | (4,800,000) |  |
Accounting Standards Update 2017-07 |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Selling, general and administrative expenses |  | (4,000,000) | (7,100,000) | (7,200,000) |  |
Other income (expense), net |  | 9,200,000 | 7,100,000 | 7,200,000 |  |
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 |  |  |  |  | $ 1.0 | $ 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 |  | $ 157,600,000 | 115,600,000 | $ 88,900,000 |  |
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] |  |  |  |  |  |
Income taxes receivable, current |  | $ 69,400,000 | 54,200,000 |  |  |
Restricted cash |  | 31,000,000 | 21,400,000 |  |  |
Other Current Liabilities |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Restricted cash |  | $ 31,000,000 | $ 21,400,000 |  |  |
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 |  | 0.7 | 0.3 | 0.1 |  |
U.S. Information Solutions |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Percentage of revenue from a segment |  | 37.00% |  |  |  |
Retained Earnings |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Impact of Tax Cuts and Jobs Act of 2017 |  |  | $ 50,000,000 |  |  |
Cybersecurity Incident |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Insurance settlements receivable |  | $ 0 | $ 35,000,000 |  |  |
Other Income |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Foreign currency transaction loss |  | $ 1,800,000 |  |  |  |

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