Restructuring Restructuring Costs by Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Severance and benefit related costs	$ 9,500	$ 40,000	$ 687	$ 0	$ 0
Restructuring and Related Cost, Incurred Cost			49,518
Allowance for Doubtful Accounts [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			11,947
Inventories [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			2,746
Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			11,871
Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			10,896
Other Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			5,013
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			6,358
Corrosion Protection [Member]
Restructuring Cost and Reserve [Line Items]
Severance and benefit related costs			0
Restructuring and Related Cost, Incurred Cost			22,234
Corrosion Protection [Member] | Allowance for Doubtful Accounts [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Corrosion Protection [Member] | Inventories [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Corrosion Protection [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			11,338
Corrosion Protection [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			10,896
Corrosion Protection [Member] | Other Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Corrosion Protection [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Infrastructure Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Severance and benefit related costs			687
Restructuring and Related Cost, Incurred Cost			27,284
Infrastructure Solutions [Member] | Allowance for Doubtful Accounts [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			11,947
Infrastructure Solutions [Member] | Inventories [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			2,746
Infrastructure Solutions [Member] | Impaired Long-Lived Assets Held and Used, Asset Name [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			533
Infrastructure Solutions [Member] | Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			0
Infrastructure Solutions [Member] | Other Assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			5,013
Infrastructure Solutions [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			$ 6,358