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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 |  |

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