Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended					3 Months Ended
	Mar. 31, 2012 Environmental	Mar. 31, 2011 Environmental	Dec. 31, 2011 Environmental	Mar. 31, 2012 Brazilian Tax Disputes - Case 1	Aug. 31, 2005 Brazilian Tax Disputes - Case 2	Mar. 31, 2012 Other defendants case claim
Commitments and Contingencies
Accruals for environmental matters	$ 2.4		$ 2.5
Charges related to environmental matters	0.2	0.2
Estimated claims or assessment, before tax				3	3
Estimated claims or assessment, additional amount				31	11
Estimated claims or assessment, aggregate amount					14
Approximate number of defendants that includes the company named in legal actions						90
Minimum amount of damages						20
Maximum amount of damages						$ 25
Number of pending claims						18,730
Number of claims pending in New York Supreme Court						18,241
Number of claims pending in various counties in a number of state courts, and in certain Federal District Courts						489
Number of claims dismissed to date by stipulation or summary judgment prior to trial						25,966
Number of active or in extremis cases in New York County						808