INCOME TAXES - Income Before Income Taxes and Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Income (loss) from continuing operations before income taxes:
United States		$ (184.1)	$ 13.6		$ 123.4
Foreign		27.2	4.3		(3.7)
(Loss) income from continuing operations before income taxes		(156.9)	17.9		119.7
Provision for (benefit from) income taxes:
United States federal		9.3	11.0		40.9
State and local		8.8	2.1		16.7
Foreign		5.8	15.6		(3.2)
Provision for income taxes	$ 59.3	23.9	28.7		54.4
Current:
United States federal		(12.0)	13.1		(2.7)
State and local		1.7	2.3		3.9
Foreign		17.5	20.2		21.7
Current income tax expense (benefit)		7.2	35.6		22.9
Deferred:
United States federal		21.3	(2.1)		43.6
State and local		7.1	(0.2)		12.8
Foreign		(11.7)	(4.6)		(24.9)
Provision for deferred income taxes		$ 16.7	$ (6.9)	[1]	$ 31.5	[1]

[1] Adjusted as a result of the adoption of certain accounting pronouncements beginning on January 1, 2017. See Note 1, "Description of Business and Summaryof Significant Accounting Policies - Recently Adopted Accounting Pronouncements," for details of these adjustments.