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Fair Value Measurements - Fair Value of Investments in Marketable Securities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value Of Other Financial Instrument [Line Items]
Total investments	$ 117.8	$ 108.4
Corporate bonds [Member]
Fair Value Of Other Financial Instrument [Line Items]
Total investments	0.8	1.5
Equity securities [Member]
Fair Value Of Other Financial Instrument [Line Items]
Total investments	2.9	2.4
Government bonds [Member]
Fair Value Of Other Financial Instrument [Line Items]
Total investments	112.1	102.5
Other liquid investments [Member]
Fair Value Of Other Financial Instrument [Line Items]
Total investments	$ 2.0	$ 2.0

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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