Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 31, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 31, 2013 Segment	Dec. 31, 2012	Dec. 31, 2011
Number of operating segments									3
Revenues from transactions with other operating segments of same entity									$ 0	$ 0	$ 0
Net sales	1,661.3	1,557.1	1,659.1	1,543.7	1,622.2	1,512.6	1,475.2	1,449.5	6,421.2	6,059.5	5,808.2
Operating income (loss)									211.7	199.4	214.6
Capital expenditures									89.1	108.6	121.5
Depreciation expense									118.6	102.5	97.6
Assets	4,578.9				4,932.6				4,578.9	4,932.6
Long-lived assets	1,572.4				1,682.1				1,572.4	1,682.1
North America [Member]
Revenues from transactions with other operating segments of same entity									20.6	27.1	28.8
Net sales									2,751.6	2,340.2	2,120.2
Operating income (loss)									129.8	126.1	121.8
Capital expenditures									33.5	25.3	22.2
Depreciation expense									40.3	30.0	27.2
Assets	1,342.0				1,483.4				1,342.0	1,483.4
Europe and Mediterranean [Member]
Revenues from transactions with other operating segments of same entity									33.3	22.1	24.8
Net sales									1,629.6	1,684.2	1,737.9
Operating income (loss)									(0.3)	(13.0)	30.3
Capital expenditures									18.4	35.3	41.1
Depreciation expense									40.3	38.0	38.3
Assets	1,232.8				1,329.6				1,232.8	1,329.6
ROW [Member]
Revenues from transactions with other operating segments of same entity									68.6	95.5	38.1
Net sales									2,040.0	2,035.1	1,950.1
Operating income (loss)									82.2	86.3	62.5
Capital expenditures									37.2	48.0	58.2
Depreciation expense									38.0	34.5	32.1
Assets	2,004.1				2,119.6				2,004.1	2,119.6
Electric Utility [Member]
Net sales									2,148.5	2,004.8	1,792.8
Electrical Infrastructure [Member]
Net sales									1,674.2	1,611.5	1,708.3
Construction [Member]
Net sales									1,568.9	1,519.0	1,395.3
Communications [Member]
Net sales									713.0	651.2	655.3
Rod Mill Products [Member]
Net sales									316.6	273.0	256.5
UNITED STATES [Member]
Net sales									1,919.8	1,859.5	1,712.2
Long-lived assets	331.7				337.9				331.7	337.9
CANADA [Member]
Net sales									708.0	441.3	379.8
Long-lived assets	49.3				45.6				49.3	45.6
FRANCE [Member]
Net sales									469.4	494.9	506.0
Long-lived assets	72.6				78.3				72.6	78.3
BRAZIL [Member]
Net sales									421.3	477.6	420.4
Long-lived assets	105.0				121.3				105.0	121.3
SPAIN [Member]
Net sales									280.7	319.0	400.1
Long-lived assets	166.0				169.8				166.0	169.8
Others [Member]
Net sales									2,622.0	2,467.2	2,389.7
Long-lived assets	$ 847.8				$ 929.2				$ 847.8	$ 929.2