PENSION AND POST-RETIREMENT BENEFITS - Aggregate Reconciliation of Projected Benefit Obligations, Plan Assets, Funded Status and Amounts Recognized (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning of year	$ (591.0)
Benefit obligation - end of year	(629.7)	$ (591.0)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning of year	432.4
Fair value of plan assets - end of year	462.4	432.4
Pension Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning of year	(591.0)	(661.4)
Service cost	(1.9)	(2.0)
Interest cost	(20.0)	(18.6)
Actuarial (loss) gain	(59.3)	42.0
Benefits paid	43.6	45.2
Plan Amendments	(1.2)	0.0
Plan participant contributions	(0.6)	(0.6)
Foreign currency translation adjustments	0.7	4.4
Benefit obligation - end of year	(629.7)	(591.0)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning of year	432.4	497.2
Actual return (loss) on plan assets	61.3	(24.2)
Employer contributions	11.4	8.0
Benefits paid	(43.6)	(45.2)
Plan participant contributions	0.6	0.6
Foreign currency translation adjustments	0.3	(4.0)
Fair value of plan assets - end of year	462.4	432.4
Funded (unfunded) status of plan	(167.3)	(158.6)
Other Post-Retirement Benefit Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning of year	(12.2)	(14.0)
Service cost	0.0	0.0
Interest cost	(0.4)	(0.4)
Actuarial (loss) gain	(1.5)	1.4
Benefits paid	0.7	0.8
Plan Amendments	0.0	0.0
Plan participant contributions	0.0	0.0
Foreign currency translation adjustments	0.0	0.0
Benefit obligation - end of year	(13.4)	(12.2)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning of year	0.0	0.0
Actual return (loss) on plan assets	0.0	0.0
Employer contributions	0.7	0.8
Benefits paid	(0.7)	(0.8)
Plan participant contributions	0.0	0.0
Foreign currency translation adjustments	0.0	0.0
Fair value of plan assets - end of year	0.0	0.0
Funded (unfunded) status of plan	$ (13.4)	$ (12.2)

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 actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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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 increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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Amount of payment to participant under defined benefit plan which decreases plan assets. 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 increases plan assets.

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

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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