Segment Information (Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013 Segment	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Number of segments									4
Net sales
Net sales	$ 761,689	$ 804,879	$ 711,692	$ 693,438	$ 782,551	$ 784,051	$ 772,953	$ 745,095	$ 2,971,698	$ 3,084,650	$ 2,887,516
Operating income (loss) by segment
Operating income by segment									18,134	89,753	138,059
Restructuring and impairments, net									(71,495)	(10,878)	(42,286)
Operating (loss) income	(65,974)	4,726	6,836	1,054	15,881	28,184	21,193	13,617	(53,361)	78,875	95,773
Depreciation & Amortization
Depreciation and amortization									80,187	84,353	84,067
Capital expenditures
Capital expenditures									101,501	109,836	88,589
Transportation Americas
Net sales
Net sales									879,831	907,838	942,014
Operating income (loss) by segment
Operating income by segment									(23,158)	9,513	62,368
Restructuring and impairments, net									(57,104)	(2,369)	(7,406)
Depreciation & Amortization
Depreciation and amortization									28,465	28,215	27,365
Capital expenditures
Capital expenditures									32,105	38,872	25,011
Transportation Europe & ROW
Net sales
Net sales									926,978	1,014,292	922,870
Operating income (loss) by segment
Operating income by segment									20,335	55,928	65,792
Restructuring and impairments, net									(8,163)	(4,115)	(6,816)
Depreciation & Amortization
Depreciation and amortization									19,052	18,590	18,991
Capital expenditures
Capital expenditures									36,323	40,195	25,768
Industrial Energy Americas
Net sales
Net sales									368,386	339,328	295,364
Operating income (loss) by segment
Operating income by segment									28,266	41,657	25,220
Restructuring and impairments, net									(1,136)	(652)	(1,687)
Depreciation & Amortization
Depreciation and amortization									10,963	11,701	11,441
Capital expenditures
Capital expenditures									9,313	7,392	19,148
Industrial Energy Europe & ROW
Net sales
Net sales									796,503	823,192	727,268
Operating income (loss) by segment
Operating income by segment									21,787	14,435	23,149
Restructuring and impairments, net									(4,613)	(2,301)	(22,954)
Depreciation & Amortization
Depreciation and amortization									17,386	21,039	19,278
Capital expenditures
Capital expenditures									16,120	15,915	14,808
Unallocated corporate
Operating income (loss) by segment
Operating income by segment									(29,096)	(31,780)	(38,470)
Restructuring and impairments, net									(479)	(1,441)	(3,423)
Depreciation & Amortization
Depreciation and amortization									4,321	4,808	6,992
Capital expenditures
Capital expenditures									$ 7,640	$ 7,462	$ 3,854