Segments and Related Information (Schedule of Segment Reporting Information, by Segment - EBITDA) (Details) (Continuing Operations [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
EBITDA	$ 427.6	$ 322.1	$ 267.9
Operating Segments [Member] | Communications [Member]
Segment Reporting Information [Line Items]
EBITDA	247.7	192.0	154.3
Operating Segments [Member] | Oil and Gas [Member]
Segment Reporting Information [Line Items]
EBITDA	215.9	99.4	80.1
Operating Segments [Member] | Electrical Transmission [Member]
Segment Reporting Information [Line Items]
EBITDA	41.2	38.7	28.7
Operating Segments [Member] | Power Generation and Industrial [Member]
Segment Reporting Information [Line Items]
EBITDA	(16.3)	32.0	(3.2)
Operating Segments [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
EBITDA	0.5	2.0	0.4
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
EBITDA	$ (61.4)	$ (42.0)	$ 7.6