Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Dec. 31, 2016
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	$ 859.8		$ 895.5
Gross carrying value, Total	416.1		367.9
Non-amortized trademarks	$ 79.3		64.2
Weighted-average amortization period (in years)	12 years
Aggregate amortization expense	$ 7.1	$ 6.1
Estimated annual amortization expense for fiscal period 2017	26.9
Estimated annual amortization expense for fiscal period 2018	24.0
Estimated annual amortization expense for fiscal period 2019	20.9
Estimated annual amortization expense for fiscal period 2020	17.1
Estimated annual amortization expense for fiscal period 2021	14.8
Estimated annual amortization expense for fiscal period 2022	10.1
Repair Systems & Information Group [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	597.3		640.6
Commercial & Industrial Group [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	250.0		242.4
BTC [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	8.6
Car-O-Liner Holding AB [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	69.0
Car-O-Liner Holding AB [Member] | Repair Systems & Information Group [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	68.1
Car-O-Liner Holding AB [Member] | Commercial & Industrial Group [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	0.9
Car-O-Liner Holding AB [Member] | Trademarks [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying value, Total	14.5
Ryeson Corporation [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	5.0
Customer relationships [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying value, Total	$ 187.1		$ 142.6
Weighted-average amortization period (in years)	16 years
Customer relationship contractual term, minimum (in years)	3 years
Customer relationship contractual term, maximum (in years)	5 years
Customer relationships [Member] | Car-O-Liner Holding AB [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying value, Total	$ 44.3