RETIREMENT PLANS - Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension | U.S. Pension.
Defined Benefit Plan Disclosure
Total	$ 1,719.7	$ 1,668.5	$ 2,376.8
Pension | International Pension
Defined Benefit Plan Disclosure
Total investments at fair value	827.4	859.8
Investments measured at NAV	43.8	45.3
Total	871.2	905.1	$ 1,219.9
Pension | International Pension | Level 1
Defined Benefit Plan Disclosure
Total investments at fair value	12.6	9.9
Total	12.6	9.9
Pension | International Pension | Level 2
Defined Benefit Plan Disclosure
Total investments at fair value	814.8	849.9
Total	814.8	849.9
Pension | International Pension | Level 3
Defined Benefit Plan Disclosure
Total	0.0	0.0
Pension | International Pension | Cash
Defined Benefit Plan Disclosure
Total investments at fair value	12.6	9.9
Pension | International Pension | Cash | Level 1
Defined Benefit Plan Disclosure
Total investments at fair value	12.6	9.9
Pension | International Pension | International equity
Defined Benefit Plan Disclosure
Total investments at fair value	182.5	219.3
Pension | International Pension | International equity | Level 2
Defined Benefit Plan Disclosure
Total investments at fair value	182.5	219.3
Pension | International Pension | Corporate bonds
Defined Benefit Plan Disclosure
Total investments at fair value	147.5	158.5
Pension | International Pension | Corporate bonds | Level 2
Defined Benefit Plan Disclosure
Total investments at fair value	147.5	158.5
Pension | International Pension | Government bonds
Defined Benefit Plan Disclosure
Total investments at fair value	321.4	365.9
Pension | International Pension | Government bonds | Level 2
Defined Benefit Plan Disclosure
Total investments at fair value	321.4	365.9
Pension | International Pension | Insurance contracts
Defined Benefit Plan Disclosure
Total investments at fair value	163.4	106.2
Pension | International Pension | Insurance contracts | Level 2
Defined Benefit Plan Disclosure
Total investments at fair value	163.4	106.2
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension.
Defined Benefit Plan Disclosure
Total investments at fair value	1,289.8	1,237.8
Total	1,722.1	1,671.7
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Level 1
Defined Benefit Plan Disclosure
Total investments at fair value	546.6	523.6
Total	546.6	523.6
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Level 2
Defined Benefit Plan Disclosure
Total investments at fair value	743.2	714.2
Total	743.2	714.2
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Level 3
Defined Benefit Plan Disclosure
Total	0.0	0.0
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Cash
Defined Benefit Plan Disclosure
Total investments at fair value	30.1	54.8
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Cash | Level 1
Defined Benefit Plan Disclosure
Total investments at fair value	30.1	54.8
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Large cap equity
Defined Benefit Plan Disclosure
Total investments at fair value	276.1	237.1
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Large cap equity | Level 1
Defined Benefit Plan Disclosure
Total investments at fair value	276.1	237.1
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Small cap equity
Defined Benefit Plan Disclosure
Total investments at fair value	44.2	40.5
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Small cap equity | Level 1
Defined Benefit Plan Disclosure
Total investments at fair value	14.6	15.4
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Small cap equity | Level 2
Defined Benefit Plan Disclosure
Total investments at fair value	29.6	25.1
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | International equity
Defined Benefit Plan Disclosure
Total investments at fair value	59.6	54.6
Investments measured at NAV	432.3	433.9
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | International equity | Level 1
Defined Benefit Plan Disclosure
Total investments at fair value	40.4	37.4
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | International equity | Level 2
Defined Benefit Plan Disclosure
Total investments at fair value	19.2	17.2
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Core fixed income
Defined Benefit Plan Disclosure
Total investments at fair value	820.3	792.0
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Core fixed income | Level 1
Defined Benefit Plan Disclosure
Total investments at fair value	150.7	145.5
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Core fixed income | Level 2
Defined Benefit Plan Disclosure
Total investments at fair value	669.6	646.5
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | High-yield bonds
Defined Benefit Plan Disclosure
Total investments at fair value	34.7	33.4
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | High-yield bonds | Level 1
Defined Benefit Plan Disclosure
Total investments at fair value	34.7	33.4
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Emerging markets
Defined Benefit Plan Disclosure
Total investments at fair value	24.8	25.4
U.S. Pension and Postretirement Health Care Benefits | U.S. Pension. | Emerging markets | Level 2
Defined Benefit Plan Disclosure
Total investments at fair value	$ 24.8	$ 25.4