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COMMITMENTS AND CONTINGENCIES (Additional Information) (Details) customer in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) office lawsuit claim | Dec. 31, 2017 USD ($) customer office lawsuit claim | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Rental expense for operating leases |  | $ 34,500,000 | $ 29,100,000 | $ 24,200,000
Cash paid for data processing, outsourcing services and other agreements |  | $ 40,000,000 | $ 45,000,000 | $ 50,000,000
Qualifying termination period, continuation of benefits for executives |  | 3 years |  |
Qualifying termination period, continuation of benefits for executives, automatic renewal |  | 3 years |  |
Change in control event, voting stock acquired (or more) |  | 20.00% |  |
Conditional payment for unrecognized severance benefit for key executives |  | $ 45,900,000 |  |
Assumed tax on expected payment for unrecognized severance benefit for key executives | $ 10,300,000 | $ 10,300,000 |  |
Conditional payout percentage of target award |  | 100.00% |  |
Maximum potential future payments required to make under guarantees | 0 | $ 0 |  |
Change in control event, minimum common stock received |  | 66.67% |  |
Letter of Credit |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Notional amount | 0 | $ 0 |  |
Minimum |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Benefit continuation period |  | 2 years |  |
Maximum |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Benefit continuation period |  | 3 years |  |
Performance Bonds |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Notional amount | 0 | $ 0 |  |
Data Processing, Outsourcing Services And Other Agreements | Minimum |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Data processing, outsourcing services and other agreements, expiration year |  | 2018 |  |
Data processing, outsourcing services and other agreements, estimated aggregate contractual obligation | 125,000,000 | $ 125,000,000 |  |
Non cancelable contractual obligations within any annual period | 85,000,000 | $ 85,000,000 |  |
Data Processing, Outsourcing Services And Other Agreements | Maximum |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Data processing, outsourcing services and other agreements, expiration year |  | 2022 |  |
IBM Operations Support Services Agreement |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Expected future year's minimum contractual obligation | 48,000,000 | $ 48,000,000 |  |
Expected future year's minimum contractual obligation within any annual period | 24,000,000 | $ 24,000,000 |  |
Cybersecurity Incident |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Number of customers impacted | customer |  | 145,500 |  |
Loss contingency, loss in period | $ 164,000,000 |  |  |
Number of state Attorneys General offices in cooperation with | office | 49 | 49 |  |
Number of putative shareholder derivative lawsuits | lawsuit | 4 | 4 |  |
Number of claims for violations of certain federal securities laws | claim | 3 | 3 |  |
Insurance settlements receivable | $ 35,000,000 | $ 35,000,000 |  |
Proceeds from insurance settlement | $ 15,000,000 | $ 15,000,000 |  |
Cybersecurity Incident | U.S. |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Number of customers, personal information accessed | customer |  | 182 |  |
Number of customers, name and partial driver's license information stolen | customer |  | 2,400 |  |
Cybersecurity Incident | United States and Canada |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Number of customers, credit card information accessed | customer |  | 209 |  |
Cybersecurity Incident | Canada |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Number of customers, personal information accessed | customer |  | 19 |  |
Cybersecurity Incident | U.K. |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Number of customers, personal information accessed | customer |  | 860 |  |
Cybersecurity Incident | GEORGIA |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Number of putative class actions | lawsuit | 4 | 4 |  |
Cybersecurity Incident, Investigation, Remediation, Legal, And Other Professional Services |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Loss contingency, loss in period |  | $ 113,300,000 |  |
Insurance coverage amount |  | 125,000,000 |  |
Insurance coverage deductible |  | 7,500,000.0 |  |
Cybersecurity Incident, Investigation, Remediation, Legal, And Other Professional Services | Cost of services |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Loss contingency, loss in period |  | 14,200,000 |  |
Cybersecurity Incident, Investigation, Remediation, Legal, And Other Professional Services | Selling, general and administrative expenses |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Loss contingency, loss in period |  | 99,100,000 |  |
Cybersecurity Incident, Free Credit File Monitoring And Identity Theft Protection Offering |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Loss contingency, loss in period |  | $ 50,700,000 |  |

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