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Shareholders' Equity (Assumptions Used To Value Share-Based Compensation) (Details)	6 Months Ended	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Shareholders' Equity [Abstract]
Dividend yield (as a percent)	3.00%	2.00%	2.00%	2.00%
Risk-free interest rate (as a percent)	1.00%	2.00%	2.00%	2.00%
Stock volatility (as a percent)	30.00%	32.00%	31.00%	32.00%
Average expected life (in years)	7 years	8 years	8 years	8 years

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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