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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) shares in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) segment shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
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 | $ 11,000,000.0 |  |  |  |
Advertising costs from continuing operations | 59,000,000.0 | $ 51,900,000 | $ 43,100,000 |  |
Depreciation and amortization | 399,300,000 | 337,300,000 | 315,900,000 |  |
Fixed assets, pledged as collateral | 156,400,000 | 156,400,000 |  |  |
Goodwill and intangible asset impairment | 0 | 0 | 0 |  |
Carrying value of investment | 127,700,000 |  |  |  |
Unrealized gain on investment | 116,600,000 |  |  |  |
Foreign currency transaction loss | 7,500,000 | 3,000,000.0 | 1,600,000 |  |
Fair value of debt | 4,800,000,000 | 3,600,000,000 |  |  |
Long term debt carrying amount | 4,400,000,000 | 3,400,000,000 |  |  |
Variable interest entity, maximum exposure to loss | $ 26,800,000 |  |  |  |
Variable interest entity, ownership percentage | 75.00% |  |  |  |
Redemption premium | $ 0 |  |  |  |
Cumulative effect of change in accounting principle | 3,210,300,000 | 2,622,900,000 | 3,155,600,000 |  | $ 3,239,000,000.0
Cumulative adjustment from change in accounting principle |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Cumulative effect of change in accounting principle |  | (400,000) |  |  | 4,200,000
Property and Equipment |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Depreciation and amortization | $ 249,300,000 | 191,000,000.0 | $ 157,600,000 |  |
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 | 21,300,000 | 35,600,000 |  |  |
Restricted cash | 25,100,000 | 29,300,000 |  |  |
Other Current Liabilities |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Restricted cash | 25,100,000 | 29,300,000 |  |  |
Legal fees | $ 379,700,000 | $ 589,000,000.0 |  |  |
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 | 0.4 | 1.1 | 0.7 |  |
U.S. Information Solutions | Revenue Benchmark |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Largest segment's percent of total operating revenue (as a percent) | 36.00% |  |  |  |
Retained Earnings |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Cumulative effect of change in accounting principle | $ 4,185,400,000 | $ 3,854,600,000 | $ 4,425,900,000 |  | 4,600,600,000
Retained Earnings | Cumulative adjustment from change in accounting principle |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Cumulative effect of change in accounting principle | (284,100,000) | (400,000) | (291,900,000) | $ (302,600,000) | (298,400,000)
Accumulated Other Comprehensive Loss |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Cumulative effect of change in accounting principle | (171,400,000) | (354,400,000) | (334,500,000) |  | (412,000,000.0)
Accumulated Other Comprehensive Loss | Cumulative adjustment from change in accounting principle |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Cumulative effect of change in accounting principle | 284,100,000 | 277,200,000 | 291,900,000 |  | $ 302,600,000
Cybersecurity Incident | Other Current Liabilities |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Legal fees | 355,200,000 | 563,900,000 |  |  |
Other Income |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Foreign currency transaction loss | $ 500,000 | $ 1,000,000.0 | $ 1,800,000 |  |

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