Segments and Related Information (Schedule of Segment Reporting Information by Segment - EBITDA) (Details) (Continuing Operations [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
EBITDA	$ 101.5	$ 102.7	$ 173.1	$ 176.2
Reportable Segments [Member] | Communications [Member]
Segment Reporting Information [Line Items]
EBITDA	57.9	63.4	101.4	109.8
Reportable Segments [Member] | Oil and Gas [Member]
Segment Reporting Information [Line Items]
EBITDA	35.7	51.2	70.6	93.6
Reportable Segments [Member] | Electrical Transmission [Member]
Segment Reporting Information [Line Items]
EBITDA	17.0	11.5	20.5	14.9
Reportable Segments [Member] | Power Generation and Industrial [Member]
Segment Reporting Information [Line Items]
EBITDA	4.0	(8.0)	4.5	(8.2)
Reportable Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
EBITDA	0.3	0.4	0.5	0.4
Corporate [Member]
Segment Reporting Information [Line Items]
EBITDA	$ (13.4)	$ (15.8)	$ (24.4)	$ (34.3)