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Noncontrolling Interest - Interest Acquired and Interest Sold (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	1 Months Ended
	Dec. 31, 2011	Jan. 31, 2012 Volclay South Africa (Proprietary) Limited [Member]	Feb. 28, 2011 Vengawave (Proprietary) Limited [Member]
Noncontrolling Interest (Textual) [Abstract]
Remaining noncontrolling interest acquired	$ 5.7	$ 5.6
Percentage of interest sold (in hundredths)			26.00%

Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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