Acquisitions and Divestitures (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Income tax benefit	$ (0.2)	$ (0.3)
Net loss from discontinued operations	(0.3)	(0.4)
Ready-Mix Concrete Operations
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues	0	31.6
Loss from discontinued operations before income taxes	(0.5)	(0.7)
Income tax benefit	(0.2)	(0.3)
Net loss from discontinued operations	$ (0.3)	$ (0.4)