ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)

12 Months Ended

Dec. 31, 2019

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS).

Schedule of changes in accumulated other comprehensive income (loss) by component, net of tax

					Non-				Accumulated
			Post-		Qualified				Other
	Pension		Retirement		Pension				Comprehensive
(In millions)	Benefits		Benefits		Benefits		Other		Income (Loss)
Balance at December 31, 2017	$	(40.6)	$	15.6	$	(0.3)	$	0.4	$	(24.9)
Reclassification adjustment related to the Tax Act (1)		(9.2)		3.4		(0.2)		—		(6.0)
Amortization of prior service cost		(1.7)		(2.9)		(0.1)		—		(4.7)
Amortization of net loss (gain)		(4.3)		5.6		0.5		(0.7)		1.1
Balance at December 31, 2018		(55.8)		21.7		(0.1)		(0.3)		(34.5)
Amortization of prior service cost		(1.7)		(2.6)		(0.1)		(0.1)		(4.5)
Amortization of net loss (gain)		5.6		(2.8)		(0.2)		0.1		2.7
Other adjustments		—		—		—		(0.6)		(0.6)
Balance at December 31, 2019	$	(51.9)	$	16.3	$	(0.4)	$	(0.9)	$	(36.9)

(1) Reclassification from accumulated other comprehensive income (loss) to retained earnings for the remeasurement tax effects resulting from applying the Tax Act in accordance with ASU 2018-02.