ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Changes in accumulated other comprehensive loss by component, net of taxes
Balance at the beginning of the period	$ 805.7	$ 755.3
Amortization of prior service cost	(1.2)	(1.1)
Amortization of net loss	1.3	0.9
Other adjustments	(0.7)
Balance at the end of the period	800.2	763.0
Pensions
Changes in accumulated other comprehensive loss by component, net of taxes
Balance at the beginning of the period	(51.9)	(55.8)
Amortization of prior service cost	(0.5)	(0.4)
Amortization of net loss	1.1	0.7
Balance at the end of the period	(51.3)	(55.5)
Post Retirement
Changes in accumulated other comprehensive loss by component, net of taxes
Balance at the beginning of the period	16.3	21.7
Amortization of prior service cost	(0.6)	(0.7)
Amortization of net loss	0.1	0.2
Balance at the end of the period	15.8	21.2
Non-Qualified Plans
Changes in accumulated other comprehensive loss by component, net of taxes
Balance at the beginning of the period	(0.4)	(0.1)
Amortization of prior service cost	(0.1)
Amortization of net loss	0.1
Balance at the end of the period	(0.4)	(0.1)
Other
Changes in accumulated other comprehensive loss by component, net of taxes
Balance at the beginning of the period	(0.9)	(0.3)
Foreign currency exchange	(0.5)
Other adjustments	(0.2)
Balance at the end of the period	(1.6)	(0.3)
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive loss by component, net of taxes
Balance at the beginning of the period	(36.9)	(34.5)
Amortization of prior service cost	(1.2)	(1.1)
Amortization of net loss	1.3	0.9
Foreign currency exchange	(0.5)
Other adjustments	(0.2)
Balance at the end of the period	$ (37.5)	$ (34.7)