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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) AUD in Billions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 04, 2015 shares | Oct. 24, 2014 USD ($) shares | Jun. 30, 2016 USD ($) shares | Jun. 30, 2015 shares | Feb. 04, 2015 shares | Jun. 30, 2016 USD ($) shares | Jun. 30, 2015 shares | Dec. 31, 2015 USD ($) | Jan. 31, 2016 USD ($) | Jan. 31, 2016 AUD | Dec. 31, 2015 AUD
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of long term debt |  |  | $ 2,700,000,000 |  |  | $ 2,700,000,000 |  | $ 1,200,000,000 |  |  |
Carrying value of long term debt |  |  | 2,500,000,000 |  |  | 2,500,000,000 |  | 1,100,000,000 |  |  |
Variable interest maximum exposure to loss |  |  | $ 13,400,000.0 |  |  | $ 13,400,000.0 |  |  |  |  |
Variable interest entity, ownership interest |  |  | 75.00% |  |  | 75.00% |  |  |  |  |
Redemption premium |  |  |  |  |  | $ 0 |  |  |  |  |
Accelerated Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchases, settlement (payment) or receipt |  | $ 115,000,000 |  |  |  |  |  |  |  |  |
Number of treasury shares repurchased | shares | 20,000 | 1,400,000 |  |  | 1,420,000 |  |  |  |  |  |
Accelerated share repurchase program, adjustment percent |  | 10.00% |  |  |  |  |  |  |  |  |
Accelerated share repurchase program, adjustment |  | $ 11,500,000 |  |  |  |  |  |  |  |  |
Other Current Assets |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  | $ 20,500,000 |  |  | 20,500,000 |  |  |  |  |
Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted cash and cash equivalents |  |  | $ 20,500,000 |  |  | 20,500,000 |  |  |  |  |
Foreign Exchange Option |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Foreign currency option, weighted average strike price |  |  |  |  |  |  |  | 0.7225 | $ 0.7091 |  |
Derivative, notional amount | AUD |  |  |  |  |  |  |  |  |  | AUD 1.0 | AUD 1.0
Derivative, gain on derivative |  |  |  |  |  |  |  | 4,700,000 |  |  |
Derivative asset |  |  |  |  |  |  |  | $ 14,400,000 |  |  |
Derivative, loss on derivative |  |  |  |  |  | $ 15,400,000 |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, options, antidilutive | shares |  |  | 0 | 0 |  | 0 | 0 |  |  |  |

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