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Summary of Short-Term Borrowings and Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Commercial paper issuances	$ 30.0	$ 0
Various debt due to international banks	2.4	2.6
Total short-term borrowings	32.4	2.6
Net long-term debt	249.8	249.7
3.35% Senior Notes Due December 15, 2015
Debt Instrument [Line Items]
Long-term debt 3.35% Senior notes due December 15, 2015	250.0	250.0
Less: Discount	(0.2)	(0.3)
Net long-term debt	$ 249.8	$ 249.7

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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