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Acquisitions and Divestitures (Details) (USD $) In Millions, unless otherwise specified		3 Months Ended
	Apr. 30, 2013	Mar. 31, 2013 Construction Products Group	Mar. 31, 2012 Construction Products Group
Acquisition:
Total cost		$ 53.8	$ 0
Net cash paid		9.1	0
Goodwill recorded		2.5	0
Divestiture:
Proceeds		35.6	0
Gain recognized		12.4	0
Goodwill charged off		4.8	0
Purchase price of acquisition of business in Mexico, exclusive of the assumption of certain specific liabilities	$ 23.1

- Definition

The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.

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- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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- Definition

Write-off of the carrying amount of goodwill associated with all or a portion of a reporting unit that is sold in the period.

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