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Summary of Short-Term Borrowings and Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Commercial paper issuances	$ 250.0	$ 0
Various debt due to international banks	4.4	2.6
Total short-term borrowings	254.4	2.6
Net long-term debt	649.4	249.7
3.35% Senior Notes Due December 15, 2015
Debt Instrument [Line Items]
Senior notes	250.0	250.0
Less: Discount	(0.2)	(0.3)
2.875% Senior notes due October 1, 2022
Debt Instrument [Line Items]
Senior notes	400.0	0
Less: Discount	$ (0.4)	$ 0

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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