Pensions and Other Benefits (Details) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended				3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Pension Plans [Member]	Sep. 30, 2011 Pension Plans [Member]	Sep. 30, 2012 Other Postretirement Benefits [Member]	Sep. 30, 2011 Other Postretirement Benefits [Member]	Mar. 31, 2012 Sweden Pension Plans [Member]	Jun. 30, 2012 US and Canada Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost						$ 2,554,000	$ 2,547,000	$ 804,000	$ 684,000
Interest cost						9,824,000	15,102,000	2,766,000	2,864,000
Expected return on assets						(9,436,000)	(11,943,000)
Transition obligation						59,000	66,000
Prior service cost/(credit)						339,000	27,000	(2,751,000)	(2,750,000)
Net actuarial loss						3,774,000	4,266,000	2,412,000	2,259,000
Settlement charge			119,735,000			119,735,000				9,200,000	110,500,000
Net periodic benefit costs						126,849,000	10,065,000	3,231,000	3,057,000
Combined pension liability	$ 26,900,000		$ 26,900,000		$ 101,200,000