Operating Segment and Geographic Information - Schedule of Operating Segment Data (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net Sales
Net sales	$ 195.4	$ 262.2	$ 412.1	$ 488.3
Segment Operating Income
Operating income		36.5	42.5	60.3
Specialty Construction Chemicals
Net Sales
Net sales	115.9	150.4	241.3	282.1
Segment Operating Income
Operating income	9.9	14.2	17.8	22.1
Specialty Building Materials
Net Sales
Net sales	79.5	111.8	170.8	206.2
Segment Operating Income
Operating income	$ 11.0	$ 22.3	$ 24.7	$ 38.2