The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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+ Details

Legal Proceedings (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			0 Months Ended		3 Months Ended	0 Months Ended
	Mar. 31, 2012	Jan. 16, 2012	Nov. 08, 2011	Jul. 26, 2010 Stifel Financial Corp. [Member]	Mar. 31, 2012 OPEB Trusts [Member]	Mar. 31, 2012 Depfa Bank [Member]	Apr. 29, 2010 Auction Rate Securities [Member]
Proposed FINRA settlement			$ 0.2
Investments made by OBEP Trusts					200.0
Purchase of investments				162.5
Assertion by Plaintiffs that the school districts contributed this amount to the OPEB trusts to purchase investments	37.5
Amount borrowed by the school districts to purchase investments						162.5
Par value of auction rate securities sold							15.7
Bond offering		50.0
Agreed cash settlement payment	13.0
Funded letter of credit	$ 9.5