Exercise price of the warrants.

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Changes in shareholders' equity - additional information (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014	Dec. 31, 2007
Shareholders Equity [Line Items]
Repurchase of outstanding common stock, authorized amount					$ 300,000,000
Debt instrument, stated interest rate	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	5.6	6.4	5.7	6.5
Convertible Note
Shareholders Equity [Line Items]
Weighted average antidilutive which were not included in the calculation of earnings per share	3.3	2.7	3.2	2.6
Per share market price of common stock	$ 61.32		$ 61.32
Strike price of warrents			$ 74.65
Conversion of convertible notes, shares issued upon conversion	2.7	1.9	2.5	1.7