Supplemental Financial Statement Information - Schedule of Net Sales by Reportable Segment Disaggregated Based on Contract Type (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Consolidated net sales	$ 1,099.5	$ 1,120.5
CCS [Member]
Disaggregation Of Revenue [Line Items]
Consolidated net sales	646.1	673.6
CMS [Member]
Disaggregation Of Revenue [Line Items]
Consolidated net sales	453.4	446.9
Product Contracts [Member]
Disaggregation Of Revenue [Line Items]
Consolidated net sales	1,079.2	1,096.8
Product Contracts [Member] | CCS [Member]
Disaggregation Of Revenue [Line Items]
Consolidated net sales	644.9	671.5
Product Contracts [Member] | CMS [Member]
Disaggregation Of Revenue [Line Items]
Consolidated net sales	434.3	425.3
Project Contracts [Member]
Disaggregation Of Revenue [Line Items]
Consolidated net sales	11.4	10.5
Project Contracts [Member] | CMS [Member]
Disaggregation Of Revenue [Line Items]
Consolidated net sales	11.4	10.5
Other Contracts [Member]
Disaggregation Of Revenue [Line Items]
Consolidated net sales	8.9	13.2
Other Contracts [Member] | CCS [Member]
Disaggregation Of Revenue [Line Items]
Consolidated net sales	1.2	2.1
Other Contracts [Member] | CMS [Member]
Disaggregation Of Revenue [Line Items]
Consolidated net sales	$ 7.7	$ 11.1