SEGMENT AND GEOGRAPHIC INFORMATION - INFORMATION ABOUT THE COMPANY'S OPERATINGS IN DIFFERENT GEOGRAPHIC AREAS (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [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
Property, plant and equipment, net	802.4				870.6				802.4	870.6	876.0
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales									1,374.8	1,269.9	1,376.5
Property, plant and equipment, net	168.4				211.1				168.4	211.1	202.0
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales									478.1	494.3	493.3
Property, plant and equipment, net	327.5				339.3				327.5	339.3	331.5
Sweden
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales									56.6	55.2	52.4
Property, plant and equipment, net	98.7				99.3				98.7	99.3	103.4
Other Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales									2,119.7	2,166.9	2,071.2
Property, plant and equipment, net	$ 207.8				$ 220.9				$ 207.8	$ 220.9	$ 239.1