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Changes in shareholders' equity - additional information (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2007 | Sep. 28, 2014 | Sep. 29, 2013 | Sep. 28, 2014 | Sep. 29, 2013 | Dec. 31, 2013
Shareholders Equity [Line Items] |  |  |  |  |  |
Repurchase of outstanding common stock, authorized amount | $ 300,000,000 |  |  |  |  |
Per share market price of common stock |  | $ 61.32 |  | $ 61.32 |  |
Strike price of warrents |  |  |  | $ 74.65 | $ 74.65 |
Conversion of convertible notes, shares issued upon conversion |  | 2.0 | 0.3 | 1.8 | 0.3 |
Debt instrument, stated interest rate |  | 3.875% | 3.875% | 3.875% | 3.875% | 3.875%
Equity Option |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Weighted average antidilutive which were not included in the calculation of earnings per share |  | 6.3 | 8.0 | 6.4 | 7.9 |
Convertible Note |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |
Weighted average antidilutive which were not included in the calculation of earnings per share |  | 2.8 | 1.4 | 2.7 | 1.4 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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