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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Statement of Income and Comprehensive Income [Abstract]
Unrealized holding gain on available-for-sale securities (net of taxes of $nil and $2.3 million)	$ 0	$ 2.3
Other than temporary impairment of available-for-sale securities (net of taxes of $nil in all periods)	$ 0	$ 0

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.