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Short- Term Investments (Details Textuals) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2011	Dec. 15, 2011
Short Term Investments (Additional Textuals) [Textuals]
Unsecured Exchangable senior notes, Percentage	1.50%
Short- Term Investments (Textuals) [ Abstract]
Realized/Unrealized holding gains and losses included in interest expense, net	$ 0.2
Available cash used along with funds related to trading Portfolio	145.9
Amount paid to partially fund the redemption of senior exchangeable notes	310.1
Unsecured Senior Exchangeable Notes Due Two Thousand Twenty Six [Member]
Short Term Investments (Additional Textuals) [Textuals]
Redemption of the Aggregate Principal Amount	$ 400.0
Unsecured Exchangable senior notes, Percentage	1.50%
Redemption price as a pecentage of principal amount		100.00%

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period.

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