Segments and Related Information (Schedule of Financial Information by Reportable Segment - EBITDA) (Details) (Continuing Operations [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segments and Related Information [Line Items]
EBITDA	$ 128.2	$ 132.1	$ 301.2	$ 308.3
Reportable Segments [Member] | Communications [Member]
Segments and Related Information [Line Items]
EBITDA	52.4	71.8	153.7	181.6
Reportable Segments [Member] | Oil and Gas [Member]
Segments and Related Information [Line Items]
EBITDA	73.0	68.1	143.5	161.7
Reportable Segments [Member] | Electrical Transmission [Member]
Segments and Related Information [Line Items]
EBITDA	12.7	12.1	33.2	27.0
Reportable Segments [Member] | Power Generation and Industrial [Member]
Segments and Related Information [Line Items]
EBITDA	4.9	(6.4)	9.4	(14.6)
Reportable Segments [Member] | Other [Member]
Segments and Related Information [Line Items]
EBITDA	(0.3)	0.1	0.1	0.5
Corporate [Member]
Segments and Related Information [Line Items]
EBITDA	$ (14.5)	$ (13.6)	$ (38.7)	$ (47.9)