Acquisitions - Additional Information (Detail) - USD ($) $ in Millions					3 Months Ended		6 Months Ended
	May 04, 2017	Jan. 30, 2017	Nov. 16, 2016	Oct. 31, 2016	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Cash purchase price of acquisition, net of cash acquired							$ 80.2
Goodwill					$ 899.2		899.2		$ 895.5
Operating expenses					279.3	$ 264.9	557.8	$ 524.8
Norbar [Member]
Business Acquisition [Line Items]
Cash purchase price of acquisition	$ 72.4
Cash purchase price of acquisition, net of cash acquired	$ 70.7
Goodwill					24.5		24.5
BTC [Member]
Business Acquisition [Line Items]
Cash purchase price of acquisition, net of cash acquired		$ 9.2
Goodwill					5.9		5.9
BTC [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Non-amortized trademark					2.0
Ryeson Corporation [Member]
Business Acquisition [Line Items]
Cash purchase price of acquisition			$ 13.0
Cash purchase price of acquisition, net of cash acquired			$ 12.6
Goodwill					5.0		5.0
Working capital adjustment							0.1
Ryeson Corporation [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Non-amortized trademark							3.7
Car-O-Liner Holding AB [Member]
Business Acquisition [Line Items]
Cash purchase price of acquisition				$ 152.0
Cash purchase price of acquisition, net of cash acquired				$ 148.1
Goodwill					66.1		66.1
Working capital adjustment							0.2
Pretax benefit/expense					$ 0.1		(0.5)
Cost of goods sold							0.2
Operating expenses							$ 0.3