RETIREMENT PLANS (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
United States | Pension
Net periodic benefit costs
Service cost				$ 68.4	$ 72.8	$ 74.5
Interest cost on benefit obligation				70.3	89.0	83.1
Expected return on plan assets				(152.9)	(149.5)	(161.9)
Recognition of net actuarial loss (gain)				51.9	23.6	39.0
Amortization of prior service cost (benefit)				(7.4)	(11.5)	(6.8)
Curtailments and settlements				2.5	9.1
Total expense (benefit)				$ 32.8	$ 33.5	$ 27.9
Other Pension Plan Information
Contributions to plan	$ 120.0
Plan amendments, decrease in benefit obligation		$ 40.4
Discount rate (as a percent)		4.34%		2.48%	3.20%	4.34%
United States | Postretirement Health Care
Net periodic benefit costs
Service cost				$ 1.2	$ 1.4	$ 2.7
Interest cost on benefit obligation				4.4	5.6	5.6
Expected return on plan assets				(0.4)	(0.4)	(0.4)
Recognition of net actuarial loss (gain)				0.1	(4.1)	(1.9)
Amortization of prior service cost (benefit)				(11.0)	(23.2)	(19.7)
Curtailments and settlements					0.3
Total expense (benefit)				$ (5.7)	$ (20.4)	$ (13.7)
Other Pension Plan Information
Plan amendments, decrease in benefit obligation			$ 18.9
Discount rate (as a percent)		4.29%	4.36%	2.37%	3.16%	4.29%
Decrease in defined benefit cost due to re-measurement of benefit plans						$ (4.5)
International | Pension
Net periodic benefit costs
Service cost				$ 30.8	$ 30.2	33.2
Interest cost on benefit obligation				22.3	31.2	29.1
Expected return on plan assets				(63.9)	(59.9)	(63.2)
Recognition of net actuarial loss (gain)				26.1	16.3	17.2
Amortization of prior service cost (benefit)				(0.1)	(0.9)	(0.9)
Curtailments and settlements				2.2	(1.9)	2.3
Total expense (benefit)				17.4	15.0	$ 17.7
Other Pension Plan Information
Plan amendments, decrease in benefit obligation				$ 1.7	$ (0.1)
Discount rate (as a percent)		2.49%		1.13%	1.52%	2.49%
Discontinued Operations
Net periodic benefit costs
Service cost				$ 2.5	$ 7.8	$ 7.1