DEFINED BENEFIT PLANS, FAIR VALUE OF PLAN ASSETS (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2019		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 262.1		$ 262.1		$ 262.1		$ 246.9
Cash and Cash Equivalents [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount		4.3		4.3		4.3		7.8
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]	61.1		61.1		61.1		54.2
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]	23.8		23.8		23.8		20.4
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]	8.5		8.5		8.5		6.4
International - developed [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount		40.6		40.6		40.6		36.4	[4]
Commodities index [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[5]	12.7		12.7		12.7		11.8
U.S. fixed income [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[6]	111.1		111.1		111.1		103.5
Fixed Income Securities [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[6]	0.0		0.0		0.0		6.4
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount		4.3		4.3		4.3		7.8
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		4.3		4.3		4.3		7.8
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		0.0		0.0		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		0.0		0.0		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		0.0		0.0		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		0.0		0.0		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		0.0		0.0		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		0.0		0.0		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		0.0	[6]	0.0	[6]	0.0	[6]	0.0
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount		257.8		257.8		257.8		239.1
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		0.0		0.0		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]	61.1		61.1		61.1		54.2
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]	23.8		23.8		23.8		20.4
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]	8.5		8.5		8.5		6.4
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		40.6		40.6		40.6		36.4	[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]	12.7		12.7		12.7		11.8
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]	111.1		111.1		111.1		103.5
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]	0.0		0.0		0.0		6.4
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		0.0		0.0		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		0.0		0.0		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		0.0		0.0		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		0.0		0.0		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		0.0		0.0		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		0.0		0.0		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		0.0		0.0		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		0.0		0.0		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		0.0	[6]	0.0	[6]	0.0	[6]	0.0
Foreign Plan [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Benefit Obligation		547.9		547.9		547.9		260.1		$ 303.4
Service cost				4.6				4.8
Defined Benefit Plan, Plan Assets, Amount		491.7		491.7		$ 491.7		254.6		281.9
Defined Benefit Plan, Plan Assets, Business Combination				168.3				0.0
Employer contributions				11.4				6.5
Defined Benefit Plan, Benefit Obligation, Benefits Paid				11.3				6.3
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)				20.8				(15.7)
Defined Benefit Plan, Interest Cost				10.3				7.4
Actuarial (gain) loss				64.1				(34.9)
Defined Benefit Plan, Expected Return (Loss) on Plan Assets				(15.0)				(12.6)
Actual return on plan assets				48.8				(13.6)
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)				18.6				$ (15.2)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate						2.90%		2.50%
Weighted average expected long-term rate of return for other assets (in hundredths)						4.40%		4.50%
Participants contributions				1.3				$ 1.3
Defined-benefit plan costs				1.3				1.7
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		2.6		2.6		$ 2.6		0.7
Foreign Plan [Member] | Mutual Funds [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Plan Assets, Amount		458.5		458.5		458.5		226.6
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		30.6		30.6		30.6		27.3
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		2.6		2.6		2.6		0.7
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		2.6		2.6		2.6		0.7
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		0.0		0.0		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		0.0		0.0		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		458.5		458.5		458.5		226.6
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		0.0		0.0		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		458.5		458.5		458.5		226.6
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		0.0		0.0		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		30.6		30.6		30.6		27.3
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		0.0		0.0		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		0.0		0.0		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		30.6		30.6		30.6		27.3		31.5
Actual return on plan assets				3.3				(4.2)
Other Pension Plan [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Benefit Obligation		$ 42.8		42.8		$ 42.8		34.0		35.7
Service cost				1.1				1.2
Employer contributions				0.0
Defined Benefit Plan, Benefit Obligation, Benefits Paid				0.3				0.2
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)				(0.8)				(1.6)
Defined Benefit Plan, Interest Cost				0.6				0.6
Actuarial (gain) loss				8.2				$ (1.7)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		1.90%				0.90%		1.70%
Defined-benefit plan costs				(1.7)				$ (1.8)
Pension Plan [Member]
Defined Benefit Plans, Fair Value of Plan Assets by Category [Line Items]
Defined Benefit Plan, Benefit Obligation		$ 355.5		355.5		$ 355.5		334.6		368.0
Service cost				4.1				5.2		5.5
Defined Benefit Plan, Plan Assets, Amount		$ 262.1		262.1		$ 262.1		246.9		263.7
Employer contributions				2.2				31.4
Defined Benefit Plan, Benefit Obligation, Benefits Paid				30.4				33.9
Defined Benefit Plan, Interest Cost				13.9				13.0		14.4
Actuarial (gain) loss				33.3				(21.9)
Defined Benefit Plan, Expected Return (Loss) on Plan Assets				(15.1)				(16.5)		(16.3)
Actual return on plan assets				43.4				(14.3)
Weighted average expected long-term rate of return for other assets (in hundredths)		0.40%
Defined-benefit plan costs				$ (13.8)				$ (20.9)		$ (14.6)

[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