Assets and Liabilities Held for Sale and Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Apr. 03, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Aug. 31, 2015	Oct. 23, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges		$ 49.6	$ 326.4	$ 14.0
Cash divested from deconsolidation		8.2	0.0	0.0
Assets		160.8	433.7	647.7
Liabilities		53.3	174.6
Pre-tax gain (loss)		$ 8.4	54.9	(18.7)
Africa [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Uncertain period of sale of business		1 year
Dominion Wire and Cables (Fiji) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of operations	$ 9.3
Gain (loss) on divestiture of operations	$ (2.6)
Interest in joint venture, percent sold	51.00%
Keystone Electric Wire and Cable (Keystone) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of operations	$ 11.0
Interest in joint venture, percent sold	20.00%
Keystone Electric Wire and Cable (Keystone) [Member] | Selling, General and Administrative Expenses [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on divestiture of operations	$ 3.6
Thailand Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of operations					$ 88.0
India Operations [Member] | Cost of Sales [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges		$ 13.6	16.5
North America [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expected restructuring charge						$ 14.0
Restructuring costs incurred		3.4
North America [Member] | Thailand Operations [Member] | Selling, General and Administrative Expenses [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on divestiture of operations		14.5
Africa/Asia Pacific [Member] | Phelps Dodge International Philippines, Inc. (PDP) and Phelps Dodge Philippines Energy Products Corporation (PDEP) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of operations			67.1
Gain (loss) on divestiture of operations			(17.6)
Asia Pacific [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax gain (loss)		$ (8.2)	$ (53.9)	$ (24.9)