PENSION PLANS - Projected benefit obligation and fair value of plan assets for defined benefit pension plans (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in fair value of plan assets
Fair value of plan assets, beginning	$ 9.0	$ 8.8
Fair value of plan assets, ending	10.2	9.0	$ 8.8
Amounts recognized in the balance sheet:
Accumulated benefit obligation	81.4	69.6
Projected benefit obligation	83.7	69.5
Accumulated benefit obligation	75.5	64.1
Fair value of plan assets	8.2	7.1
U.S. Plans
Changes in actuarial present value of projected benefit obligation
Projected benefit obligation, beginning	0.9	4.4
Service cost			0.1
Interest cost			0.4
Actuarial loss		(0.6)
Benefits paid		(0.2)
Settlements		(2.7)
Projected benefit obligation, ending	0.9	0.9	4.4
Changes in fair value of plan assets
Fair value of plan assets, beginning		3.7
Employer contributions	0.1	0.1
Benefits paid	(0.1)	(0.2)
Settlements		(2.7)
Foreign currency translation and other		(0.9)
Fair value of plan assets, ending			3.7
Net amount recognized in the balance sheet	(0.9)	(0.9)
Amounts recognized in the balance sheet:
Current liability	(0.1)
Noncurrent liability	(0.8)	(0.9)
Net amount recognized in the balance sheet	(0.9)	(0.9)
U.S. Plans \| Underfunded
Amounts recognized in the balance sheet:
Funded status	0.9
U.S. Plans \| Unfunded Plan
Amounts recognized in the balance sheet:
Funded status	0.9
Non-U.S. Plans
Changes in actuarial present value of projected benefit obligation
Projected benefit obligation, beginning	75.5	76.7
Service cost	2.4	2.6	2.8
Interest cost	2.4	2.3	2.6
Actuarial loss	13.4	4.8
Benefits paid	(2.4)	(2.2)
Participant contributions	0.3	0.3
Settlements		(0.1)
Curtailments		(4.1)
Foreign currency translation and other	(1.0)	(4.8)
Projected benefit obligation, ending	90.6	75.5	76.7
Changes in fair value of plan assets
Fair value of plan assets, beginning	13.7	14.3
Actual return on plan assets	1.0	0.2
Employer contributions	2.4	2.1
Participants' contributions	0.3	0.3
Benefits paid	(2.4)	(2.2)
Settlements		(0.1)
Foreign currency translation and other	(0.1)	(0.9)
Fair value of plan assets, ending	14.9	13.7	$ 14.3
Net amount recognized in the balance sheet	(75.7)	(61.8)
Amounts recognized in the balance sheet:
Noncurrent asset	0.5	0.6
Current liability	(2.2)	(1.8)
Noncurrent liability	(74.0)	(60.6)
Net amount recognized in the balance sheet	(75.7)	(61.8)
Pretax accumulated other comprehensive (income) loss	15.0	$ 1.6
Non-U.S. Plans \| Underfunded
Amounts recognized in the balance sheet:
Funded status	75.7
Non-U.S. Plans \| Unfunded Plan
Amounts recognized in the balance sheet:
Funded status	$ 76.2

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement.

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Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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