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Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 768.6 | $ 749.9 | $ 738.2 | $ 740.0 | $ 698.1 | $ 683.9 | $ 667.0 | $ 636.9 | $ 2,996.7 | $ 2,685.9 | $ 2,536.5
Gross profit | 323.8 | 306.7 | 305.9 | 302.3 | 289.6 | 283.3 | 283.7 | 262.7 | 1,238.7 | 1,119.3 | 1,009.8
Net earnings | $ 22.7 | $ 93.7 | $ 92.4 | $ 87.7 | $ 82.7 | $ 83.2 | $ 87.1 | $ 73.5 | $ 296.5 | $ 326.5 | $ 282.9
Basic earnings per share | $ 0.13 | $ 0.54 | $ 0.53 | $ 0.51 | $ 0.48 | $ 0.48 | $ 0.50 | $ 0.42 | $ 1.72 | $ 1.87 | $ 1.59
Diluted earnings per share | 0.13 | 0.54 | 0.53 | 0.50 | 0.47 | 0.47 | 0.49 | 0.41 | $ 1.70 | $ 1.85 | $ 1.58
Common dividends declared | $ 0.14 | $ 0.14 | $ 0.14 | $ 0.14 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 |  |  |

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