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Incentive Plans (Details 1) (USD $)	12 Months Ended
Incentive Plans (Details 1) (USD $)	Dec. 31, 2011 Y	Dec. 31, 2010 Y	Dec. 31, 2009 Y
SOSARs
Fair value	$ 10.51	$ 12.05	$ 14.74
Risk-free interest rate	2.27%	3.15%	2.14%
Dividend yield	1.95%	2.00%	2.22%
Volatility	31.57%	27.58%	35.04%
Expected term	7.75	7.50	7.50

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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