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ACQUISITIONS AND INVESTMENTS (Additional Information) (Details) AUD / shares in Units, AUD in Millions |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 16, 2016 | Feb. 24, 2016 USD ($) | Feb. 24, 2016 AUD | Dec. 31, 2017 USD ($) | Nov. 15, 2017 | Aug. 10, 2017 | Dec. 31, 2016 USD ($) | Aug. 23, 2016 | Feb. 24, 2016 AUD AUD / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 2,715,300,000 |  |  | $ 2,685,400,000 |  |
Bridge loan, term | 364 days | 364 days | 364 days |  |  |  |  |  |
364 Day Revolver |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 800,000,000 |  |  |  |  |  |  |
Bridge loan, term | 364 days |  |  | 364 days |  |  |  |  |
Term loan, due Nov 2018 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 400,000,000 |  |  | $ 450,000,000 |  |
Debt instrument, face amount |  | $ 800,000,000 |  |  |  |  |  |  |
Debt instrument, term |  | 3 years | 3 years |  |  |  |  |  |
ID Watchdog, Inc. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  | 100.00% |  |  |
Mercury Group Of Companies Pty Ltd |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  | 100.00% |  |  |  |
Veda |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  | 100.00% |  |  |  |  |  |  | 100.00%
Business combination, consideration transferred |  | $ 1,700,000,000 | AUD 2,400.0 |  |  |  |  |  |
Business combination, separately recognized transactions, liabilities recognized |  | 189,500,000 |  |  |  |  |  |  | AUD 261.9
Business acquisition, share price (in Australian dollars per share) | AUD / shares |  |  |  |  |  |  |  |  | AUD 2.825
Long-term debt |  | $ 1,700,000,000 |  |  |  |  |  |  |
Barnett and Computersoft |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  |  |  | 100.00% |

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