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3. Fair Value Measurements Fair Value and Gross Unrealized Losses with Unrealized Losses (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair value	$ 77.8	$ 51.1
Gross unrealized losses for investments in a loss position 12 months or more	0.3	0.6
Gross unrealized losses for investments in a loss position less than 12 months	$ 0.8	$ 0.5
Cost Method Investment, Percentage Owned	30.00%

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized neither as held-to-maturity nor trading securities.

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