Segments and Related Information (Schedule of Financial Information by Reportable Segment - EBITDA - Continuing Operations) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
EBITDA - Continuing Operations:
EBITDA - Continuing operations	$ 67.8	$ 134.2	$ 164.4	$ 303.6
Reportable Segments [Member] | Communications [Member]
EBITDA - Continuing Operations:
EBITDA - Continuing operations	49.7	52.5	141.8	153.7
Reportable Segments [Member] | Oil and Gas [Member]
EBITDA - Continuing Operations:
EBITDA - Continuing operations	51.0	73.4	113.9	144.2
Reportable Segments [Member] | Electrical Transmission [Member]
EBITDA - Continuing Operations:
EBITDA - Continuing operations	(23.7)	18.5	(47.6)	35.1
Reportable Segments [Member] | Power Generation and Industrial [Member]
EBITDA - Continuing Operations:
EBITDA - Continuing operations	4.8	4.9	3.9	9.4
Reportable Segments [Member] | Other [Member]
EBITDA - Continuing Operations:
EBITDA - Continuing operations	(2.0)	(0.7)	(7.1)	(0.1)
Corporate [Member]
EBITDA - Continuing Operations:
EBITDA - Continuing operations	$ (12.0)	$ (14.4)	$ (40.5)	$ (38.7)