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Changes in shareholders' equity - additional information (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 29, 2015 | Mar. 30, 2014 | Jun. 30, 2007 | Dec. 31, 2014
Shareholders Equity [Line Items] |  |  |  |
Repurchase of outstanding common stock, authorized amount |  |  | $ 300,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |
Debt instrument, stated interest rate | 3.875%us-gaap_DebtInstrumentInterestRateStatedPercentage | 3.875%us-gaap_DebtInstrumentInterestRateStatedPercentage |  |
Equity Option |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Weighted average antidilutive which were not included in the calculation of earnings per share | 5.8 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 6.5 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember |  |
Convertible Note |  |  |  |
Shareholders Equity [Line Items] |  |  |  |
Weighted average antidilutive which were not included in the calculation of earnings per share | 3.1 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember | 2.5 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |
Per share market price of common stock |  |  |  | $ 61.32 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
Strike price of warrents | 74.65 invest_InvestmentWarrantsExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |  |
Conversion of convertible notes, shares issued upon conversion | 2.3 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember | 1.6 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember |  |

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- Definition Exercise price of the warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
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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 Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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