Quarterly Information (Unaudited) Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

	2012 Quarter Ended											2011 Quarter Ended
	March 31		June 30			September 30			December 31			March 31		June 30		September 30		December 31
Revenue	$	738.3	$	988.9		$	1,067.3		$	932.3		$	573.6	$	709.9	$	816.2	$	731.6
Income from continuing operations before non-controlling interests	11.7		31.2			36.1			37.6			16.3		43.4		30.8		7.0
Income (loss) from discontinued operations	2.5		(1.1		)	(9.3		)	(1.3		)	4.8		1.1		1.0		1.6
Net income attributable to MasTec	$	14.2	$	30.1		$	26.8		$	36.3		$	21.1	$	44.5	$	31.8	$	8.6
Basic earnings (loss) per share (a)
Continuing operations	$	0.15	$	0.39		$	0.47		$	0.50		$	0.21	$	0.52	$	0.36	$	0.08
Discontinued operations	0.03		(0.01		)	(0.12		)	(0.02		)	0.06		0.01		0.01		0.02
Total basic earnings per share	$	0.18	$	0.37		$	0.35		$	0.48		$	0.27	$	0.53	$	0.37	$	0.10
Diluted earnings (loss) per share (a)
Continuing operations	$	0.14	$	0.38		$	0.45		$	0.46		$	0.20	$	0.50	$	0.35	$	0.08
Discontinued operations	0.03		(0.01		)	(0.12		)	(0.02		)	0.06		0.01		0.01		0.02
Total diluted earnings per share	$	0.17	$	0.37		$	0.34		$	0.45		$	0.26	$	0.51	$	0.36	$	0.10

(a) Note that due to rounding differences, the sum of the Company’s quarterly earnings per share in a given year may not be the same as the Company’s year to date earnings per share for the same period. In addition, earnings per share calculations may contain slight summation differences due to rounding. See Note 2 – Earnings per Share.