Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details)

v3.8.0.1
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%