ACCUMULATED OTHER COMPREHENSIVE LOSS Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
AOCI - Postretirement Benefits	$ (128.2)	$ (130.5)	$ (131.0)	$ 131.5	$ (135.4)	$ 136.5	$ (128.2)	$ 131.5	$ (131.6)	$ (137.6)
AOCI - Cumulative Translation Adjustment	(275.4)	(241.0)	(246.3)	(236.2)	(231.2)	(184.1)	(275.4)	(236.2)	(243.9)	(210.6)
Net change during period - AOCI Postretirement Benefits	2.3	0.5	0.6	3.9	1.1	1.1	3.4	6.1
Net change during period - AOCI Cumulative Translation Adjustment	(34.4)	5.3	(2.4)	(5.0)	(47.1)	26.5
Total other comprehensive loss, net of tax	(32.1)	5.8	(1.8)	(1.1)	(46.0)	27.6	(28.1)	(19.5)
Total accumulated other comprehensive loss	$ (403.6)	$ (371.5)	$ (377.3)	$ (367.7)	$ (366.6)	$ (320.6)	$ (403.6)	$ (367.7)	$ (375.5)	$ (348.2)

Amount, after 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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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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