SEGMENT AND GEOGRAPHIC REGION INFORMATION - Sales and Long Lived Assets by Geographical Region (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
Sales to clients attributed to the geographic areas based on the origin of sale
Sales	$ 371.5	$ 356.5	$ 367.3	$ 332.8	$ 354.6	$ 327.7	$ 323.4	$ 296.6	$ 1,428.1	$ 1,302.3	$ 1,132.9
Property, plant, and equipment, net	239.0				215.0				239.0	215.0	200.6
United States
Sales to clients attributed to the geographic areas based on the origin of sale
Sales									1,183.6	1,066.8	977.7
Property, plant, and equipment, net	191.3				172.7				191.3	172.7	157.8
Canada
Sales to clients attributed to the geographic areas based on the origin of sale
Sales									37.2	37.3	52.9
Property, plant, and equipment, net	28.9				26.9				28.9	26.9	29.3
Europe
Sales to clients attributed to the geographic areas based on the origin of sale
Sales									206.9	197.4	100.2
Property, plant, and equipment, net	18.8				15.4				18.8	15.4	13.5
Other
Sales to clients attributed to the geographic areas based on the origin of sale
Sales									0.4	0.8	2.1
Property, plant, and equipment, net	$ 0.0				$ 0.0				$ 0.0	$ 0.0	$ 0.0