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Stockholders' Equity and Accumulated Other Comprehensive Income (Loss) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	20 Months Ended
	Mar. 31, 2013	Mar. 31, 2013
Stock Repurchase Program, Authorized Amount	$ 300.0
Stock Repurchase Program, Period in Force	3 years
Stock Repurchased and Retired During Period, Shares	1.4	9.7
Stock Repurchased and Retired During Period, Value	$ 33.8	$ 171.4

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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