DEFINED BENEFIT PLANS, FAIR VALUE OF PLAN ASSETS (Details) - USD ($)		3 Months Ended	10 Months Ended	12 Months Ended
		Mar. 31, 2017	Dec. 31, 2015	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016	Feb. 19, 2015
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				$ 247,100,000	$ 263,700,000
Cash and Cash Equivalents [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				7,800,000	7,400,000
U.S. large cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[1]			54,200,000	59,900,000
U.S. mid cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[2]			20,400,000	23,600,000
U.S. small cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]			6,500,000	7,700,000
International - developed [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				36,500,000	39,100,000	[4]
Commodities index [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[5]			11,800,000	12,800,000
U.S. fixed income [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[6]			103,500,000	107,000,000
Fixed Income Securities [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[6]			6,400,000	6,200,000
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				7,800,000	7,400,000
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				7,800,000	7,400,000
Fair Value, Inputs, Level 1 [Member] | U.S. large cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[1]			0	0
Fair Value, Inputs, Level 1 [Member] | U.S. mid cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[2]			0	0
Fair Value, Inputs, Level 1 [Member] | U.S. small cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]			0	0
Fair Value, Inputs, Level 1 [Member] | International - developed [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				0	0	[4]
Fair Value, Inputs, Level 1 [Member] | Commodities index [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[5]			0	0
Fair Value, Inputs, Level 1 [Member] | U.S. fixed income [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[6]			0	0
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[6]			0
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				239,300,000	256,300,000
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				0	0
Fair Value, Inputs, Level 2 [Member] | U.S. large cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[1]			54,200,000	59,900,000
Fair Value, Inputs, Level 2 [Member] | U.S. mid cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[2]			20,400,000	23,600,000
Fair Value, Inputs, Level 2 [Member] | U.S. small cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]			6,500,000	7,700,000
Fair Value, Inputs, Level 2 [Member] | International - developed [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				36,500,000	39,100,000	[4]
Fair Value, Inputs, Level 2 [Member] | Commodities index [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[5]			11,800,000	12,800,000
Fair Value, Inputs, Level 2 [Member] | U.S. fixed income [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[6]			103,500,000	107,000,000
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[6]			6,400,000	6,200,000
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				0	0
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				0	0
Fair Value, Inputs, Level 3 [Member] | U.S. large cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[1]			0	0
Fair Value, Inputs, Level 3 [Member] | U.S. mid cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[2]			0	0
Fair Value, Inputs, Level 3 [Member] | U.S. small cap - blend [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[3]			0	0
Fair Value, Inputs, Level 3 [Member] | International - developed [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				0	0	[4]
Fair Value, Inputs, Level 3 [Member] | Commodities index [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[5]			0	0
Fair Value, Inputs, Level 3 [Member] | U.S. fixed income [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[6]			0	0
Fair Value, Inputs, Level 3 [Member] | Fixed Income Securities [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[6]			0
Foreign Plan [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Benefit Obligation				260,100,000	303,400,000		$ 278,100,000
Service cost			$ 5,100,000	4,800,000	5,100,000
Defined Benefit Plan, Plan Assets, Amount				254,600,000	281,900,000		233,200,000
Employer contributions				6,500,000	6,300,000
Defined Benefit Plan, Benefit Obligation, Benefits Paid			6,100,000	6,300,000	6,100,000
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)			26,400,000	(15,700,000)
Defined Benefit Plan, Interest Cost			7,600,000	7,400,000	7,600,000
Actuarial (gain) loss			(7,700,000)	(34,900,000)
Defined Benefit Plan, Expected Return (Loss) on Plan Assets				(12,600,000)	(11,500,000)
Net Defined Benefit Plan Amortization And Deferral				0	700,000
Actual return on plan assets				(13,600,000)	23,600,000
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)				$ (15,200,000)	23,600,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		2.70%		2.50%
Weighted average expected long-term rate of return for other assets (in hundredths)		4.70%		4.50%
Participants contributions				$ 1,300,000	1,300,000
Defined-benefit plan costs				1,700,000	(600,000)
Foreign Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				700,000	800,000
Foreign Plan [Member] | Mutual Funds [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				226,600,000	249,600,000
Foreign Plan [Member] | Life and Annuity Insurance Product Line [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				27,300,000	31,500,000
Foreign Plan [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				700,000	800,000
Foreign Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				700,000	800,000
Foreign Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				0	0
Foreign Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Life and Annuity Insurance Product Line [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				0	0
Foreign Plan [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				226,600,000	249,600,000
Foreign Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				0	0
Foreign Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				226,600,000	249,600,000.0
Foreign Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Life and Annuity Insurance Product Line [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				0	0
Foreign Plan [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				27,300,000	31,500,000
Foreign Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				0	0
Foreign Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				0	0
Foreign Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Life and Annuity Insurance Product Line [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount				27,300,000	31,500,000		29,800,000
Actual return on plan assets				(4,200,000)	1,700,000
Other Pension Plan [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Benefit Obligation				34,000,000	35,700,000		29,000,000
Service cost				1,200,000	1,200,000
Employer contributions			$ 0
Defined Benefit Plan, Benefit Obligation, Benefits Paid				200,000	200,000
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)				(1,600,000)	4,200,000
Defined Benefit Plan, Interest Cost				600,000	500,000
Actuarial (gain) loss				$ (1,700,000)	1,000,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		1.70%		1.70%
Defined-benefit plan costs				$ (1,800,000)	(1,700,000)
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Benefit Obligation								$ 32,800,000
Pension Plan [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Benefit Obligation				338,500,000	368,000,000		366,500,000
Service cost				5,200,000	5,500,000		4,900,000
Defined Benefit Plan, Plan Assets, Amount				250,800,000	263,700,000		247,500,000
Employer contributions				31,400,000	17,600,000
Defined Benefit Plan, Benefit Obligation, Benefits Paid				30,000,000	30,600,000
Defined Benefit Plan, Interest Cost				13,000,000	14,400,000		15,500,000
Actuarial (gain) loss				(21,900,000)	12,200,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets				(16,500,000)	(16,300,000)		(16,700,000)
Actual return on plan assets				$ (14,300,000)	29,200,000
Weighted average expected long-term rate of return for other assets (in hundredths)				0.40%
Defined-benefit plan costs				$ (20,900,000)	$ (14,600,000)		$ (14,900,000)

[1] This category represents an equity index fund not actively managed that tracks the S&P 500 Index.

[2] This category represents an equity index fund not actively managed that tracks the S&P mid-cap 400 Index.

[3] This category represents an equity index fund not actively managed that tracks the Russell 2000 Index.

[4] This category represents an equity index fund not actively managed that tracks the MSCI ACWI ex USA Index.

[5] This category represents a real estate index fund not actively managed that tracks the Vanguard REIT Index.

[6] This category primarily represents bond index funds not actively managed that track the Northern Trust U.S. Aggregate Index a