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Long-Term Debt Investment Income (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |
Gain on Distribution of Short Term Investments for which Redemptions were Previously Suspended | $ 0.1 | $ 2.3

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- Definition Represents the gain recorded during the period associated with distributions from certain short term investments for which redemptions had previously been suspended and an other-than-temporary-impairment had been recorded. + References No definition available. + Details
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Balance Type: | na
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- Details
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