v3.5.0.2

Restructuring and Divestiture Costs - Schedule of Our Charges Under Both the 2015 Building Products Restructuring Plan and the 2013 Building Products Restructuring Plan (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Restructuring Cost and Reserve [Line Items] |  |  |
Total | $ 22.4 | $ 16.7 | $ 10.0
2013 Building Products Restructuring Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and Plant Closing Costs | 0.1 | 1.9 |
Total | 0.1 |  |
2015 Building Products Restructuring Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and Plant Closing Costs | 4.5 |  |
Impairment of Long-Lived Assets | 2.4 |  |
Divestitures | 2.3 |  |
Total | 9.2 |  |
Building Products [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and Plant Closing Costs | 4.6 |  |
Impairment of Long-Lived Assets | 2.4 |  |
Divestitures | 2.3 |  |
Total | 9.3 | 4.2 | 2.8
Building Products [Member] | 2013 Building Products Restructuring Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and Plant Closing Costs |  | 1.9 | 1.0
Impairment of Long-Lived Assets |  | 0.4 | 1.8
Divestitures |  | 1.8 |
Total |  | $ 4.1 | $ 2.8
Building Products [Member] | 2015 Building Products Restructuring Plan [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and Plant Closing Costs | 4.6 |  |
Divestitures | 2.3 |  |
Total | $ 9.3 |  |

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