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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information [Table Text Block] | A summary of the company's consolidated quarterly results of operations is as follows:
|  | First Quarter |  | Second Quarter (b) |  | Third Quarter |  | Fourth Quarter (c) |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ | 5,759,552 |  |  | $ | 6,465,346 |  |  | $ | 6,953,740 |  |  | $ | 7,633,870 |  |
Gross profit |  |  | 759,887 |  |  |  | 823,966 |  |  |  | 843,358 |  |  |  | 930,128 |  |
Operating income |  |  | 191,722 |  |  |  | 229,822 |  |  |  | 235,992 |  |  |  | 270,914 |  |
Net income attributable to shareholders |  |  | 113,768 |  |  |  | 99,679 |  |  |  | 134,630 |  |  |  | 53,885 |  |
Net income per share (a): |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.27 |  |  | $ | 1.12 |  |  | $ | 1.52 |  |  | $ | 0.61 |  |
Diluted |  | $ | 1.26 |  |  | $ | 1.11 |  |  | $ | 1.50 |  |  | $ | 0.60 |  |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ | 5,474,177 |  |  | $ | 5,972,101 |  |  | $ | 5,936,092 |  |  | $ | 6,442,891 |  |
Gross profit |  |  | 748,898 |  |  |  | 798,791 |  |  |  | 773,162 |  |  |  | 823,348 |  |
Operating income |  |  | 181,364 |  |  |  | 223,592 |  |  |  | 198,684 |  |  |  | 254,899 |  |
Net income attributable to shareholders |  |  | 106,235 |  |  |  | 134,270 |  |  |  | 117,727 |  |  |  | 164,518 |  |
Net income per share (a): |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.16 |  |  | $ | 1.46 |  |  | $ | 1.29 |  |  | $ | 1.84 |  |
Diluted |  | $ | 1.14 |  |  | $ | 1.45 |  |  | $ | 1.28 |  |  | $ | 1.81 |  |
(a) | Quarterly net income per share is calculated using the weighted-average shares outstanding during each quarterly period, while net income per share for the full year is calculated using the weighted-average shares outstanding during the year. Therefore, the sum of the net income per share for each of the four quarters may not equal the net income per share for the full year.
(b) | Net income attributable to shareholders includes a loss on extinguishment of debt of $58.8 million during the second quarter of 2017
(c) | Net income attributable to shareholders includes a U.S. Tax Act expense of $124.7 million during the fourth quarter of 2017.

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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=68076893&loc=d3e1280-108306 + Details
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