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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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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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