Acquisitions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 French Acquisition [Member]	Mar. 31, 2013 Brazilian Acquisition [Member]
Fair Value of Purchase Consideration [Abstract]
Cash Paid for Acquired Entity				$ 17	$ 26
Purchase Price Allocation [Abstract]
Bargain purchase gain	$ 0	$ 2.1	$ 5.1