Noncontrolling interests (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Balance			$ 768,020,000
Consolidated net income	19,183,000	16,344,000	58,030,000	50,190,000
Dividends declared			(2,700,000)
Dividends paid to non-controlling interest			(3,394,000)	0
Capital contributions by non-controlling interest			800,000
Currency Translation Adjustment	8,562,000	(25,356,000)	1,595,000	(3,170,000)
Unamortized pension gains and prior service costs	1,829,000	(1,138,000)	5,481,000	1,817,000
Net derivative gains (losses) arising during the year	(299,000)	1,517,000	380,000	87,000
Employee benefit transactions			6,200,000
Income tax benefit arising from employee stock option			300,000
Stock based compensation			2,300,000
Purchase of common stock			(8,700,000)
Balance	828,345,000		828,345,000
Common Stock [Member]
Balance			2,900,000
Consolidated net income			0
Dividends declared			0
Dividends paid to non-controlling interest			0
Capital contributions by non-controlling interest			0
Currency Translation Adjustment			0
Unamortized pension gains and prior service costs			0
Net derivative gains (losses) arising during the year			0
Employee benefit transactions			0
Income tax benefit arising from employee stock option			0
Stock based compensation			0
Purchase of common stock			0
Balance	2,900,000		2,900,000
Additional Paid-in Capital [Member]
Balance			335,100,000
Consolidated net income			0
Dividends declared			0
Dividends paid to non-controlling interest			0
Capital contributions by non-controlling interest			0
Currency Translation Adjustment			0
Unamortized pension gains and prior service costs			0
Net derivative gains (losses) arising during the year			0
Employee benefit transactions			6,200,000
Income tax benefit arising from employee stock option			300,000
Stock based compensation			2,300,000
Purchase of common stock			0
Balance	343,900,000		343,900,000
Retained Earnings [Member]
Balance			963,100,000
Consolidated net income			56,400,000
Dividends declared			(2,700,000)
Dividends paid to non-controlling interest			0
Capital contributions by non-controlling interest			0
Currency Translation Adjustment			0
Unamortized pension gains and prior service costs			0
Net derivative gains (losses) arising during the year			0
Employee benefit transactions			0
Income tax benefit arising from employee stock option			0
Stock based compensation			0
Purchase of common stock			0
Balance	1,016,800,000		1,016,800,000
Accumulated Other Comprehensive Income (Loss) [Member]
Balance			(45,300,000)
Consolidated net income			0
Dividends declared			0
Dividends paid to non-controlling interest			0
Capital contributions by non-controlling interest			0
Currency Translation Adjustment			1,600,000
Unamortized pension gains and prior service costs			5,500,000
Net derivative gains (losses) arising during the year			400,000
Employee benefit transactions			0
Income tax benefit arising from employee stock option			0
Stock based compensation			0
Purchase of common stock			0
Balance	(37,800,000)		(37,800,000)
Treasury Stock [Member]
Balance			(514,200,000)
Consolidated net income			0
Dividends declared			0
Dividends paid to non-controlling interest			0
Capital contributions by non-controlling interest			0
Currency Translation Adjustment			0
Unamortized pension gains and prior service costs			0
Net derivative gains (losses) arising during the year			0
Employee benefit transactions			0
Income tax benefit arising from employee stock option			0
Stock based compensation			0
Purchase of common stock			(8,700,000)
Balance	(522,900,000)		(522,900,000)
Noncontrolling Interest [Member]
Balance			26,400,000
Consolidated net income			1,700,000
Dividends declared			0
Dividends paid to non-controlling interest			(3,400,000)
Capital contributions by non-controlling interest			800,000
Currency Translation Adjustment			(100,000)
Unamortized pension gains and prior service costs			0
Net derivative gains (losses) arising during the year			0
Employee benefit transactions			0
Income tax benefit arising from employee stock option			0
Stock based compensation			0
Purchase of common stock			0
Balance	$ 25,400,000		$ 25,400,000