Acquisitions - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended			12 Months Ended
	Sep. 18, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 27, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other acquisitions
Payments to Acquire Businesses, Net of Cash Acquired		$ 25.0	$ 0.9	$ 96.0	$ 59.5	$ 25.0	$ 1,913.9
Goodwill		4,217.4	4,259.0		4,351.1	4,217.4	4,259.0
Goodwill, Acquired During Period				43.2	32.6	20.8
Finite-lived Intangible Assets Acquired				53.3	$ 19.1
Finite-Lived Intangible Asset, Useful Life					11 years
ERICO Global Company [Member]
Other acquisitions
Payments to Acquire Businesses, Net of Cash Acquired	$ 1,800.0
Goodwill		1,031.0	1,061.9			1,031.0	1,061.9
Indefinite-lived Intangible Assets Acquired	228.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		$ 1,033.8	1,033.8			$ 1,033.8	$ 1,033.8
Finite-lived Intangible Assets Acquired	$ 805.4
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	21 years
Canada, Dollars
Other acquisitions
Payments to Acquire Businesses, Net of Cash Acquired			$ 1.2	$ 120.5