Restricted Marketable Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2012	Dec. 31, 2011
Marketable Securities, Restricted [Abstract]
Restricted marketable securities, cost	$ 1.2	$ 1.2
Restricted marketable securities, shares	4.4	4.4
Restricted marketable securities, current	94.7	94.7	0
Unrealized (loss) gain recorded in other comprehensive income	$ (41.3)	$ 93.5

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer and that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

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