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Shareholders' Investment - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 Program
Shareholders Equity [Line Items]
Number of shares of common stock purchased	3.8
Purchase of common stock	$ 367.2
Share repurchase program, authorized amount	$ 500
Number of share repurchase programs	2

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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