Segment Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015 USD ($)	Oct. 02, 2015 USD ($)	Jul. 03, 2015 USD ($)	Apr. 03, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 26, 2014 USD ($)	Jun. 27, 2014 USD ($)	Mar. 28, 2014 USD ($)	Dec. 31, 2015 USD ($) Segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment									4
Net Sales	$ 913.3	$ 1,027.3	$ 1,113.4	$ 1,171.1	$ 1,384.4	$ 1,315.8	$ 1,387.3	$ 1,301.5	$ 4,225.1	$ 5,389.0	$ 5,781.3
Operating Income (Loss)									20.6	(246.5)	175.8
Capital Expenditures									56.5	80.8	81.0
Depreciation Expense									80.0	99.1	107.2
Assets	2,466.7				3,366.7				2,466.7	3,366.7	4,578.9
Long-lived Assets	724.8				970.6				724.8	970.6
Assets of discontinued operations	160.8				433.7				160.8	433.7	647.7
Non-current assets of discontinued operations	56.9				119.9				56.9	119.9
North America [Member]
Segment Reporting Information [Line Items]
Revenues from transactions with other operating segments of same entity									29.8	31.5	20.6
Net Sales									2,299.3	2,550.1	2,751.6
Operating Income (Loss)									84.5	101.8	127.5
Capital Expenditures									20.9	38.4	33.5
Depreciation Expense									37.1	39.8	40.3
Assets	999.0				1,220.3				999.0	1,220.3	1,342.0
Europe [Member]
Segment Reporting Information [Line Items]
Revenues from transactions with other operating segments of same entity									18.3	55.8	54.9
Net Sales									960.2	1,330.8	1,448.7
Operating Income (Loss)									6.6	(94.0)	(7.8)
Capital Expenditures									20.7	9.5	14.1
Depreciation Expense									25.2	33.1	35.5
Assets	632.0				751.4				632.0	751.4	1,045.9
Latin America [Member]
Segment Reporting Information [Line Items]
Revenues from transactions with other operating segments of same entity									19.5	31.7	72.3
Net Sales									726.8	1,143.0	1,211.9
Operating Income (Loss)									(22.8)	(247.5)	44.2
Capital Expenditures									11.1	25.6	21.5
Depreciation Expense									12.6	20.4	25.9
Assets	480.8				656.6				480.8	656.6	1,202.8
Africa/Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Sales									238.8	365.1	369.1
Operating Income (Loss)									(47.7)	(6.8)	11.9
Capital Expenditures									3.8	7.3	11.9
Depreciation Expense									5.1	5.8	5.5
Assets	354.9				738.4				354.9	738.4	988.2
Electric Utility [Member]
Segment Reporting Information [Line Items]
Net Sales									1,431.6	1,702.9	1,809.3
Electrical Infrastructure [Member]
Segment Reporting Information [Line Items]
Net Sales									1,224.9	1,552.4	1,648.9
Construction [Member]
Segment Reporting Information [Line Items]
Net Sales									819.9	1,229.5	1,348.7
Communications [Member]
Segment Reporting Information [Line Items]
Net Sales									501.5	545.3	681.6
Rod Mill Products [Member]
Segment Reporting Information [Line Items]
Net Sales									247.2	358.9	292.8
UNITED STATES [Member]
Segment Reporting Information [Line Items]
Net Sales									1,914.0	2,049.3	1,919.8
Long-lived Assets	266.0				318.9				266.0	318.9
CANADA [Member]
Segment Reporting Information [Line Items]
Net Sales									345.5	467.1	708.0
Long-lived Assets	25.4				42.3				25.4	42.3
FRANCE [Member]
Segment Reporting Information [Line Items]
Net Sales									295.2	383.6	469.4
Long-lived Assets	61.9				65.4				61.9	65.4
BRAZIL [Member]
Segment Reporting Information [Line Items]
Net Sales									247.4	457.9	421.3
Long-lived Assets	57.4				69.7				57.4	69.7
SPAIN [Member]
Segment Reporting Information [Line Items]
Net Sales									153.5	218.5	280.7
Long-lived Assets	47.6				64.0				47.6	64.0
Others [Member]
Segment Reporting Information [Line Items]
Net Sales									1,269.5	1,812.6	$ 1,982.1
Long-lived Assets	$ 266.5				$ 410.3				$ 266.5	$ 410.3