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Quarterly Financial Data - Additional Information (Detail) - Tradenames - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |
Pre-tax defined benefit plan actuarial losses | $ (0.3) | $ (2.8) | $ (12.0) | $ (1.1) | $ (0.6) | $ (2.5) | $ (13.7)
After-tax defined benefit plan actuarial losses | $ (0.2) | $ (1.8) | $ (7.6) | $ (0.7) | $ (0.4) |  |
Actuarial loss per diluted share | $ 0.00 | $ 0.01 | $ 0.04 | $ 0.01 | $ 0.00 |  |

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- Details
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