Other intangible assets, net (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule Of Other Intangible Assets By Major Class [Line Items]
Amortization expense of other intangible assets	$ 97,900,000	$ 83,700,000	$ 66,800,000
Future Amortization Expense, Year One	93,300,000
Future Amortization Expense, Year Two	90,300,000
Future Amortization Expense, Year Three	82,600,000
Future Amortization Expense, Year Four	68,800,000
Future Amortization Expense, Year Five	66,000,000
Customer Relationships [Member]
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	1,022,134,000	960,013,000
Accumulated Amortization	(302,156,000)	(235,885,000)
Net Book Value	719,978,000	724,128,000
Unpatented Technology [Member]
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	193,915,000	175,819,000
Accumulated Amortization	(72,358,000)	(54,376,000)
Net Book Value	121,557,000	121,443,000
Software [Member]
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	49,395,000	49,095,000
Accumulated Amortization	(35,833,000)	(30,182,000)
Net Book Value	13,562,000	18,913,000
Patents and other protective rights [Member]
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	25,398,000	25,505,000
Accumulated Amortization	(17,699,000)	(15,292,000)
Net Book Value	7,699,000	10,213,000
Trade secrets [Member]
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	1,500,000	1,604,000
Accumulated Amortization	(1,361,000)	(1,174,000)
Net Book Value	139,000	430,000
Trade Names [Member]
Schedule Of Other Intangible Assets By Major Class [Line Items]
Cost	231,207,000	229,386,000
Accumulated Amortization	0	0
Net Book Value	$ 231,207,000	$ 229,386,000