Pensions and Other Benefits (Details) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended				3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Pension Plans [Member]	Jun. 30, 2011 Pension Plans [Member]	Jun. 30, 2012 Other Postretirement Benefits [Member]	Jun. 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						$ 1,699,000	$ 1,698,000	$ 536,000	$ 456,000
Interest cost						7,589,000	10,068,000	1,844,000	1,909,000
Expected return on assets						(7,184,000)	(7,962,000)
Transition obligation						37,000	44,000
Prior service cost/(credit)						17,000	18,000	(1,834,000)	(1,833,000)
Net actuarial loss						2,839,000	2,844,000	1,608,000	1,506,000
Settlement charge	110,560,000		119,735,000			119,735,000				9,200,000	110,600,000
Net periodic benefit costs						124,732,000	6,710,000	2,154,000	2,038,000
Combined pension liability	$ 26,900,000		$ 26,900,000		$ 101,200,000