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Investments Investments sold (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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
Proceeds from Sale of Available-for-sale Securities | 0 | 19.1 | 21.8
Realized Investment Gains (Losses) | 0 | 15.2 | 19.0
Auction Rate Securities [Member] |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Proceeds from Sale of Available-for-sale Securities |  | $ 19.1 | $ 21.8

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