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DEFINED BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Retirement Benefits [Abstract]
Net periodic benefit costs	$ 0.5	$ 0.6	$ 1.0	$ 1.1
Service cost component	0.7	$ 0.7	1.3	$ 1.4
Estimated fair value of plan assets	$ 31.2		$ 31.2		$ 31.1

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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 net periodic benefit cost (credit) for 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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