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Income Taxes Excess Tax Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Income Tax Effects Allocated Directly to Equity [Abstract]
Stock-based compensation excess tax benefits credited directly to shareholders' equity	$ 5.7	$ 5.4

The tax effects of employee stock option transactions that are recognized differently for financial reporting and tax purposes, occurring during the period and charged or credited directly to shareholders' equity.

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