Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
shares in Millions
 12 Months Ended
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