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Earnings Per Share (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended	11 Months Ended
	Nov. 30, 2011	Sep. 30, 2012	Sep. 30, 2012
Earnings Per Share [Abstract]
Stock Repurchase Program, Authorized Amount	$ 75.0
Stock Repurchased and Retired During Period, Shares		4.7	6.4
Stock Repurchased and Retired During Period, Value		$ 57.1	$ 75.0

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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