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		$ (190.7)	$ 4.2		$ 114.4
Foreign		27.2	4.3		(3.7)
(Loss) income from continuing operations before income taxes		(163.5)	8.5		110.7
Provision for (benefit from) income taxes:
United States federal		7.0	7.6		37.7
State and local		9.0	2.3		16.9
Foreign		5.8	15.6		(3.2)
Provision for income taxes	$ 59.6	21.8	25.5		51.4
Current:
United States federal		(20.2)	9.0		(2.7)
State and local		1.9	2.5		4.1
Foreign		17.5	20.2		21.7
Current income tax expense (benefit)		(0.8)	31.7		23.1
Deferred:
United States federal		27.2	(1.4)		40.4
State and local		7.1	(0.2)		12.8
Foreign		(11.7)	(4.6)		(24.9)
Provision for deferred income taxes		$ 22.6	$ (6.2)	[1]	$ 28.3	[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.