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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Statement of Income and Comprehensive Income [Abstract]
Unrealized holding gain (loss) on available-for-sale securities, tax	$ 0.2	$ 0	$ 2.6
Other than temporary impairment of available-for-sale securities, tax	0	0	0
Realized gain on divestment of available-for-sale securities, tax	$ 3.5	$ 0	$ 0

Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

Tax effect on the reclassification adjustment for losses realized upon the write-down of securities.

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.