Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2011		Sep. 30, 2011		Jul. 01, 2011		Apr. 01, 2011		Dec. 31, 2010		Oct. 01, 2010		Jul. 02, 2010		Apr. 02, 2010		Dec. 31, 2011 Segment		Dec. 31, 2010		Dec. 31, 2009
Geographic reportable segments																	3
Revenues from transactions with other operating segments of same entity																	$ 0		$ 0		$ 0
Net sales	1,345.9	[1]	1,491.1	[2]	1,533.5	[3]	1,437.7	[4]	1,347.0	[1]	1,195.8	[5]	1,208.5	[6]	1,104.7	[7]	5,808.2	[8]	4,856.0	[8]	4,378.6	[8]
Operating income																	214.6	[8]	207.8	[8]	163.5	[8]
Capital expenditures																	121.5		115.3		143.6
Depreciation expense																	97.6		85.1		90.3
Assets	4,375.9	[8]							4,301.7	[8]							4,375.9	[8]	4,301.7	[8]
Long-lived assets	1,476.9								1,515.7								1,476.9		1,515.7
North America [Member]
Net sales																	2,120.2		1,785.0		1,484.6
Operating income																	121.8		96.9		19.8
Capital expenditures																	22.2		20.5		28.8
Depreciation expense																	27.2		28.9		29.2
Assets	791.4								866.7								791.4		866.7
Europe And Mediterranean [Member]
Revenues from transactions with other operating segments of same entity																	24.8		58.2		64.6
Net sales																	1,737.9		1,499.0		1,563.6
Operating income																	30.3		36.8		70.2
Capital expenditures																	41.1		32.9		78.3
Depreciation expense																	38.3		35.8		34.9
Assets	1,435.1								1,475.9								1,435.1		1,475.9
ROW [Member]
Revenues from transactions with other operating segments of same entity																	38.1		42.2		26.6
Net sales																	1,950.1		1,572.0		1,330.4
Operating income																	62.5		74.1		73.5
Capital expenditures																	58.2		61.9		36.5
Depreciation expense																	32.1		20.4		26.2
Assets	1,914.0								1,807.9								1,914.0		1,807.9
Corporate [Member]
Assets	235.4								151.2								235.4		151.2
Electric Utility [Member]
Net sales																	1,792.8		1,492.5		1,487.8
Electrical Infrastructure [Member]
Net sales																	1,708.3		1,345.7		1,095.2
Construction [Member]
Net sales																	1,395.3		1,196.7		1,008.5
Communications [Member]
Net sales																	655.3		593.7		626.1
Rod Mill Products [Member]
Net sales																	256.5		227.4		161.0
UNITED STATES [Member]
Net sales																	1,712.2		1,471.6		1,239.9
Long-lived assets	220.1								226.8								220.1		226.8
SPAIN [Member]
Net sales																	400.1		405.6		453.2
Long-lived assets	180.0								194.7								180.0		194.7
Others [Member]
Net sales																	3,695.9		2,978.8		2,685.5
Long-lived assets	$ 1,076.8								$ 1,094.2								$ 1,076.8		$ 1,094.2

[1] In the above table, the “As Originally Filed” rows correspond to Note 20 - Quarterly Operating Results (Unaudited) as stated in the Form 10-K for the fiscal year ended December 31, 2011 filed by the Company on February 23, 2012. The “Restatement #1” rows correspond to Note 20 - Quarterly Operating Results (Unaudited) as stated in the Form 10-K/A for the fiscal year ended December 31, 2011 filed by the Company on March 1, 2013.

[2] In the above table, the “As Originally Filed” rows correspond to Form 10-Q for the fiscal quarter ended September 30, 2011 filed by the Company on November 3, 2011. The “Restatement #1” rows correspond to Form 10-Q/A for the fiscal quarter ended September 28, 2012 filed by the Company on March 1, 2013.

[3] In the above table, the “As Originally Filed” rows correspond to Form 10-Q for the fiscal quarter ended July 1, 2011 filed by the Company on August 4, 2011. The “Restatement #1” rows correspond to Form 10-Q/A for the fiscal quarter ended June 29, 2012 filed by the Company on March 1, 2013.

[4] In the above table, the “As Originally Filed” rows correspond to Form 10-Q for the fiscal quarter ended April 1, 2011 filed by the Company on May 6, 2011. The “Restatement #1” rows correspond to Form 10-Q/A for the fiscal quarter ended March 30, 2012 filed by the Company on March 1, 2013.

[5] In the above table, the “As Originally Filed” rows correspond to Form 10-Q for the fiscal quarter ended October 1, 2010 filed by the Company on November 5, 2010. The “Restatement #1” rows correspond to Note 20 - Quarterly Operating Results (Unaudited) as stated in the Form 10-K/A for the fiscal year ended December 31, 2011 filed by the Company on March 1, 2013.

[6] In the above table, the “As Originally Filed” rows correspond to Form 10-Q for the fiscal quarter ended July 2, 2010 filed by the Company on August 6, 2010. The “Restatement #1” rows correspond to Note 20 - Quarterly Operating Results (Unaudited) as stated in the Form 10-K/A for the fiscal year ended December 31, 2011 filed by the Company on March 1, 2013.

[7] In the above table, the “As Originally Filed” rows correspond to Form 10-Q for the fiscal quarter ended April 2, 2010 filed by the Company on May 12, 2010. The “Restatement #1” rows correspond to Note 20 - Quarterly Operating Results (Unaudited) as stated in the Form 10-K/A for the fiscal year ended December 31, 2011 filed by the Company on March 1, 2013.

[8] See Note 22 - Restatement of Consolidated Financial Statements