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Quarterly Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Net Income, Basic Earnings Per Share and Diluted Earnings Per Share |
|  | 2018 |  |  | 2017 |
|  | (in millions, except per share amounts) |
First Quarter Ended March 31 |  |  |  |  |  |  |  |
Net sales |  | $ | 1,176.9 |  |  | $ | 1,102.1 |
Gross profit |  |  | 937.0 |  |  |  | 897.5 |
Net income |  |  | 82.1 |  |  |  | 85.2 |
Earnings per share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.57 |  |  | $ | 0.51 |
Diluted |  | $ | 0.54 |  |  | $ | 0.49 |
Second Quarter Ended June 30 |  |  |  |  |  |  |  |
Net sales |  | $ | 1,285.5 |  |  | $ | 1,146.9 |
Gross profit |  |  | 1,050.1 |  |  |  | 928.1 |
Net income |  |  | 94.4 |  |  |  | 137.6 |
Earnings per share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.66 |  |  | $ | 0.84 |
Diluted |  | $ | 0.62 |  |  | $ | 0.81 |
Third Quarter Ended September 30 |  |  |  |  |  |  |  |
Net sales |  | $ | 1,242.8 |  |  | $ | 1,085.4 |
Gross profit |  |  | 1,024.7 |  |  |  | 870.0 |
Net income |  |  | 71.2 |  |  |  | 54.5 |
Earnings per share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.52 |  |  | $ | 0.34 |
Diluted |  | $ | 0.49 |  |  | $ | 0.33 |
Fourth Quarter Ended December 31(1) |  |  |  |  |  |  |  |
Net sales |  | $ | 1,186.6 |  |  | $ | 1,093.3 |
Gross profit |  |  | 960.7 |  |  |  | 883.5 |
Net income (loss) |  |  | 48.9 |  |  |  | (63.4 | )
Earnings (loss) per share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.36 |  |  | $ | (0.43 | )
Diluted |  | $ | 0.34 |  |  | $ | (0.43 | )
(1) | The fourth quarters of both 2018 and 2017 include the impact of U.S. Tax Reform enacted during the fourth quarter of 2017, as described further in Note 12, Income Taxes.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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