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INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jul. 01, 2017	Apr. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Uncertain Tax Benefits
Gross unrecognized tax benefits	$ 29.0				$ 29.0
Net unrecognized tax benefits	20.2				20.2
Net unrecognized tax benefits that would impact effective tax rate if recognized	16.5				16.5
Gross accrued interest	4.5				4.5
Net accrued interest	3.4				3.4
Penalties recorded					0.0
Other Tax Matters
Income tax provision	(0.4)		$ (6.0)		(4.5)	$ (9.2)
Pre-tax income (loss) from continuing operations	$ 20.1		$ (2.3)		$ 36.6	$ 11.2
Effective income tax rate (as a percent)	2.00%		(260.90%)		12.30%	(82.10%)
Income tax expense	$ 1.7
Tax charges related to the Tax Cuts and Jobs Act of 2017	1.1				$ 0.4
Benefit for excess tax benefits related to stock compensation awards				$ 0.9
Tax Cuts and Jobs Act of 2017, provisional charges		$ 11.8
Accounting Standards Update 2016-09
Other Tax Matters
Benefit for excess tax benefits related to stock compensation awards						$ 1.2
Maximum
Uncertain Tax Benefits
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, high end of range	$ 10.0				$ 10.0
Foreign
Other Tax Matters
Foreign losses generated for which no tax benefit was recognized			$ 24.6			$ 29.6

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