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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information |
|  | 2017
(in millions except per share data) |  | First |  | Second |  | Third |  | Fourth |  | Year
Net sales |  | $ | 857.3 |  |  | $ | 1,071.7 |  |  | $ | 1,089.1 |  |  | $ | 1,071.8 |  |  | $ | 4,089.9 |
Gross margin |  | 247.7 |  |  | 314.0 |  |  | 311.5 |  |  | 274.8 |  |  | 1,148.0 |
Operating income |  | 96.0 |  |  | 159.0 |  |  | 146.7 |  |  | 104.0 |  |  | 505.7 |
Income from continuing operations |  | 61.5 |  |  | 102.3 |  |  | 86.4 |  |  | 115.1 |  |  | 365.3 |
Net income |  | 61.8 |  |  | 102.3 |  |  | 86.3 |  |  | 115.1 |  |  | 365.5 |
Basic earnings per share from continuing operations (1) |  | $ | 0.95 |  |  | $ | 1.59 |  |  | $ | 1.38 |  |  | $ | 1.84 |  |  | $ | 5.75 |
Diluted earnings per share from continuing operations (1) |  | $ | 0.94 |  |  | $ | 1.58 |  |  | $ | 1.37 |  |  | $ | 1.82 |  |  | $ | 5.71 |
|  | 2016
(in millions except per share data) |  | First |  | Second |  | Third |  | Fourth |  | Year
Net sales |  | $ | 794.0 |  |  | $ | 996.9 |  |  | $ | 991.0 |  |  | $ | 893.5 |  |  | $ | 3,675.4 |
Gross margin |  | 245.4 |  |  | 321.2 |  |  | 323.6 |  |  | 267.1 |  |  | 1,157.3 |
Operating income |  | 110.1 |  |  | 177.6 |  |  | 35.7 |  |  | 114.7 |  |  | 438.1 |
Income (loss) from continuing operations |  | 68.5 |  |  | 115.3 |  |  | (9.5 | ) |  | 76.5 |  |  | 250.8 |
Net income (loss) |  | 68.5 |  |  | 115.2 |  |  | (9.8 | ) |  | 76.2 |  |  | 250.1 |
Basic earnings (loss) per share from continuing operations (1) |  | $ | 1.06 |  |  | $ | 1.78 |  |  | $ | (0.15 | ) |  | $ | 1.18 |  |  | $ | 3.87 |
Diluted earnings (loss) per share from continuing operations (1) |  | $ | 1.05 |  |  | $ | 1.75 |  |  | $ | (0.15 | ) |  | $ | 1.17 |  |  | $ | 3.83 |
(1) The sum of quarterly earnings per share amounts may not equal the year due to rounding.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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