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BENEFIT PLANS - Components of Net Periodic Benefit Cost- Other Postretirement Benefits (Details) - Other Postretirement Benefit Plans, Defined Benefit - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 0.6	$ 0.5	$ 1.2	$ 1.0
Interest cost	0.5	0.5	1.1	1.0
Amortization of prior service cost	0.4	0.4	0.7	0.7
Amortization of actuarial gain	(0.2)	(0.4)	(0.4)	(0.8)
Net periodic pension benefit cost	1.3	1.0	2.6	1.9
Pretax reclassifications from AOCI included in net periodic postretirement benefit cost (credit)	$ 0.2	$ 0.0	$ 0.3	$ (0.1)

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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X

- Definition

Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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X

- Definition

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

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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- Definition

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

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for net period benefit cost (credit) of defined benefit plan.

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