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REPURCHASES OF COMMON STOCK (Details) - Common Class A [Member] - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jul. 31, 2018
Repurchases of Common Stock [Abstract] |  |  |  |  |
Common stock repurchased (in shares) | 0.2 | 0.4 | 0.6 | 0.8 |
Common stock repurchased | $ 12.4 | $ 25.7 | $ 48.2 | $ 47.8 |
Authorized amount for repurchase program |  |  |  |  | $ 500.0
Available for repurchase under the repurchase program | $ 492.4 |  | $ 492.4 |  |

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