Multi-employer Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Multiemployer Plans [Line Items]
EIN	91-0351110
COMPANY CONTRIBUTIONS	$ 32.8	$ 31.8	$ 27.2
Metal and Electrical Engineering Industry Pension Fund
Multiemployer Plans [Line Items]
PENSION PLAN NUMBER	135668
COMPANY CONTRIBUTIONS	$ 27.8	27.9	25.0
Western Metal Industry Pension Plan
Multiemployer Plans [Line Items]
PENSION PLAN NUMBER	001
EIN	91-6033499
COMPANY CONTRIBUTIONS	$ 3.8	2.7	1.4
Other Plans
Multiemployer Plans [Line Items]
COMPANY CONTRIBUTIONS	$ 1.2	$ 1.2	$ 0.8