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REPURCHASES OF COMMON STOCK (Details) - Common Class A [Member] - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jul. 31, 2018
Repurchases of Common Stock [Abstract] |  |  |  |  |
Common stock repurchased (in shares) | 0.2 | 0.3 | 0.5 | 0.4 |
Common stock repurchased | $ 18.4 | $ 15.3 | $ 35.8 | $ 22.1 |
Available for repurchase under the repurchase program | $ 92.2 |  | $ 92.2 |  |
Subsequent Event [Member] |  |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |  |
Authorized amount for repurchase program |  |  |  |  | $ 500.0

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