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Discontinued Operations (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended		1 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2009	Apr. 30, 2011 PSA [Member]	Dec. 31, 2010 PSA [Member]	Mar. 31, 2012 ASI [Member]	Dec. 31, 2011 ASI [Member]	Dec. 31, 2011 KEO [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business		$ 10	$ 680			$ 135	$ 210
Revenue of divested business				377		275
After-tax gain on sale of business	$ 201.7		$ 202.0		$ 93.0
After-tax gain on sale of business, per diluted share			$ 0.29		$ 0.13

Gain (loss) after tax expense or benefit, not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

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