Acquisitions and Divestitures (Tables)

9 Months Ended

Sep. 30, 2012

Business Combinations [Abstract]

Acquisition and divestiture activity

For the three and nine months ended September 30, 2012 and 2011, all of our acquisition and divestiture activity occurred in the Construction Products Group as summarized below:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
			(in millions)
Acquisitions:
Total cost	$	5.5	$	32.8	$	7.5	$	56.4
Net cash paid	$	4.9	$	27.2	$	4.9	$	42.5
Goodwill recorded	$	3.2	$	22.3	$	4.0	$	29.3
Divestitures:
Proceeds	$	—	$	—	$	2.1	$	8.3
Gain recognized	$	—	$	—	$	1.5	$	0.7
Goodwill charged off	$	—	$	—	$	0.1	$	1.0