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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) shares in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) segment shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares
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 | $ 8,100,000 |  |
Advertising costs from continuing operations | 51,900,000 | $ 43,100,000 | $ 54,600,000
Bad debt expense | 5,400,000 | 5,600,000 | 5,000,000.0
Depreciation and amortization | 337,300,000 | 315,900,000 | 290,900,000
Fixed assets, pledged as collateral | 156,400,000 | 156,400,000 |
Goodwill and intangible asset impairment | 0 | 0 | 0
Foreign currency transaction loss | 3,000,000.0 | 1,600,000 | 500,000
Fair value of debt | 3,600,000,000 | 2,600,000,000 |
Long term debt carrying amount | 3,400,000,000 | 2,600,000,000 |
Variable interest entity, maximum exposure to loss | $ 28,800,000 |  |
Variable interest entity, ownership percentage | 75.00% |  |
Redemption premium | $ 0 |  |
Reclassification resulting from Tax Act |  |  | 0
Property and Equipment |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Depreciation and amortization | $ 191,000,000.0 | 157,600,000 | $ 115,600,000
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] |  |  |
Insurance settlements receivable | $ 112,400,000 |  |
Income taxes receivable, current | 35,600,000 | 69,400,000 |
Restricted cash | 29,300,000 | 31,000,000.0 |
Other Current Liabilities |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Legal fees | 589,000,000.0 | 51,300,000 |
Restricted cash | $ 29,300,000 | $ 31,000,000.0 |
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 | 1.1 | 0.7 | 0.3
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] |  |  |
Reclassification resulting from Tax Act |  |  | $ 50,000,000.0
Cybersecurity Incident | Other Current Liabilities |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Legal fees | $ 563,900,000 |  |
Other Income |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Foreign currency transaction loss | $ 1,000,000.0 | $ 1,800,000 |

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