INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 26, 2015	Mar. 28, 2015	Sep. 27, 2014	Mar. 29, 2014	Sep. 26, 2015	Sep. 27, 2014
Uncertain Tax Benefits
Gross unrecognized tax benefits	$ 42.0				$ 42.0
Net unrecognized tax benefits	26.0				26.0
Portion of unrecognized benefits which, if recognized, would impact future effective tax rates	25.5				25.5
Gross accrued interest	5.3				5.3
Net accrued interest	4.4				4.4
Penalties recorded					0.0
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, low end of range	2.0				2.0
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, high end of range	6.0				6.0
Other Tax Matters
Income taxes	5.5		$ 5.6		(8.6)	$ 161.9
Pre-tax income (loss) from continuing operations	$ (125.2)		$ (6.6)		$ (192.2)	$ 379.4
Effective income tax rate (as a percent)	(4.40%)		(84.80%)		(4.50%)	42.70%
Pretax losses for which no tax benefit was recognized	$ 102.0				$ 130.0
Tax benefit related to audit settlements and statute expirations			$ 4.0
Income tax expense (benefit) related to planned spin-off transaction					$ 3.6
Income tax benefits related to valuation allowances recorded against foreign deferred income tax assets						$ 12.2
Tax benefit related to loss on an investment in a foreign subsidiary						(6.7)
Maximum period for which impact on state income tax returns of any federal changes remains subject to examination by various states					1 year
Foreign Jurisdictions
Other Tax Matters
Income tax expense (benefit) related to reorganization actions to facilitate separation		$ 3.4
EGS Electrical Group, LLC and Subsidiaries ("EGS")
Other Tax Matters
Gain on sale of interest in EGS				$ 491.2		$ 491.2
Minimum
Other Tax Matters
Period during which state income tax returns are subject to examination					3 years
Maximum
Other Tax Matters
Period during which state income tax returns are subject to examination					5 years