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BENEFIT PLANS - AMOUNTS RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Net actuarial loss	$ 156.7	$ 109.7
Net prior service cost	(4.2)	(4.6)
Before tax AOCI	152.5	105.1
Less: Deferred taxes	39.3	27.2
Net of tax AOCI	$ 113.2	$ 77.9

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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