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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

X

- 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

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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

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=6505113



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6510752



Reference 4: http://www.xbrl.org/2003/role/presentationRef

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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

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Price of a single share of a number of saleable stocks of a company.

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Amount of a stock repurchase plan authorized by an entity's Board of Directors.

+ References

No definition available.

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