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Investments Investments sold (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Gain (Loss) on Investments [Line Items] |  |  |
Par Value Available For Sale Securities | $ 23.4 |  |
Par Value Available For Sale Security Sold | 38.1 | 35.3 | 55.0
Proceeds from Sale of Available-for-sale Securities | 19.1 | 21.8 | 50.3
Realized Investment Gains (Losses) | 15.2 | 19.0 | 18.7
Auction Rate Securities [Member] |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Proceeds from Sale of Available-for-sale Securities | $ 19.1 | $ 21.8 | $ 21.5

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