ShareBased Compensation Plans Weighted Average Assumptions (Details) (Stock Options [Member])	12 Months Ended
	Dec. 31, 2011 Y		Dec. 31, 2010 Y
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Dividend Yield	0.00%		0.00%
Risk Free Interest Rate	1.84%	[1]	2.58%	[1]
Expected Volatility	33.19%	[2]	34.59%	[2]
Expected Life	5.5	[3]	6.5	[3]

[1] The risk-free interest rate for the periods within the contractual term of the options is based on the U.S. Treasury yield curve in effect at the time of the grant.

[2] The expected volatility is a measure of the amount by which a stock price has fluctuated or is expected to fluctuate based primarily on our and our peers' historical data.

[3] The expected life is the period of time, on average, that participants are expected to hold their options before exercise based primarily on our historical data.