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Common Stock Repurchase Program (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended	67 Months Ended
	Mar. 31, 2013	Mar. 31, 2013
Common Stock Repurchase Program [Abstract]
Stock repurchased and retired during period (shares)		14,179,711
Stock repurchased and retired during period, value		$ 88.5
Stock repurchase program, remaining authorized repurchase amount	19.8
Shares paid for tax withholding for share based compensation (shares)	58,755
Payments related to tax withholding for share-based compensation	$ 0.5

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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