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Subsequent Event Subsequent Event (Details) (ICA Holdings Pty Limited [Member], Subsequent Event [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Apr. 30, 2013
ICA Holdings Pty Limited [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Total consideration transferred	$ 7.0
Payments to acquire business	$ 3.0

This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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