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Discontinued Operations (Narrative) (Details) (USD $)	3 Months Ended		1 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended		3 Months Ended	12 Months Ended
Discontinued Operations (Narrative) (Details) (USD $)	Mar. 30, 2012	Apr. 01, 2011	Apr. 30, 2011 PSA [Member]	Jul. 01, 2011 PSA [Member]	Dec. 31, 2010 PSA [Member]	Jan. 31, 2012 ASI [Member]	Feb. 29, 2012 KEO [Member]	Mar. 31, 2012 ASI And KEO [Member]	Dec. 31, 2011 ASI And KEO [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 337,470,000		$ 680,000,000			$ 132,000,000	$ 205,000,000
Revenue of divested business	4,316,220,000	3,292,198,000			377,000,000				275,000,000
After-tax gain on sale of business	$ 93,700,000			$ 202,000,000				$ 94,000,000
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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