SEGMENT AND GEOGRAPHIC INFORMATION - NET SALES (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment									2
Revenue, Major Customer [Line Items]
Total net sales	$ 1,111.5	$ 962.1	$ 1,009.4	$ 946.2	$ 1,059.7	$ 928.4	$ 1,042.1	$ 956.1	$ 4,029.2	$ 3,986.3	$ 3,993.4
Technologies & Equipment
Revenue, Major Customer [Line Items]
Total net sales									2,283.2	2,167.7	2,202.8
Consumables
Revenue, Major Customer [Line Items]
Total net sales									1,746.0	1,818.6	1,790.6
All Products and Services, Excluding Precious Metals
Revenue, Major Customer [Line Items]
Total net sales									3,988.1	3,949.1	3,952.9
All Products and Services, Excluding Precious Metals | Technologies & Equipment
Revenue, Major Customer [Line Items]
Total net sales									2,283.2	2,167.7	2,202.8
All Products and Services, Excluding Precious Metals | Consumables
Revenue, Major Customer [Line Items]
Total net sales									1,704.9	1,781.4	1,750.1
Precious Metals
Revenue, Major Customer [Line Items]
Total net sales									$ 41.1	$ 37.2	$ 40.5