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Fair Value Measurement of Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Available-for-sale securities
Available-for-sale Securities, Fair Value	$ 801.7	$ 672.7
Fair Value, Measurements, Recurring [Member]
Available-for-sale securities
Available-for-sale Securities, Fair Value	801.7	672.7
Total fair value measurement of assets	846.9	718.8
Total fair value measurement of liabilities		33.4
Fair Value, Measurements, Recurring [Member] \| Foreign exchange forward contracts [Member]
Available-for-sale securities
Derivatives, current and long-term	9.6	18.3
Derivatives, current and long-term	24.4	25.2
Fair Value, Measurements, Recurring [Member] \| Interest rate swaps [Member]
Available-for-sale securities
Derivatives, current and long-term	35.6	27.8
Fair Value, Measurements, Recurring [Member] \| Cross-currency interest rate swaps [Member]
Available-for-sale securities
Derivatives, current and long-term		8.2
Fair Value, Measurements, Recurring [Member] \| Corporate debt securities [Member]
Available-for-sale securities
Available-for-sale Securities, Fair Value	338.5	324.7
Fair Value, Measurements, Recurring [Member] \| U.S. government agencies and debt securities [Member]
Available-for-sale securities
Available-for-sale Securities, Fair Value	215.3	177.2
Fair Value, Measurements, Recurring [Member] \| Municipal bonds
Available-for-sale securities
Available-for-sale Securities, Fair Value		1.0
Fair Value, Measurements, Recurring [Member] \| Foreign government debt securities [Member]
Available-for-sale securities
Available-for-sale Securities, Fair Value	2.8	6.8
Fair Value, Measurements, Recurring [Member] \| Commercial paper [Member]
Available-for-sale securities
Available-for-sale Securities, Fair Value	139.7	74.5
Fair Value, Measurements, Recurring [Member] \| Certificates of deposit [Member]
Available-for-sale securities
Available-for-sale Securities, Fair Value	105.4	88.5
Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member]
Available-for-sale securities
Available-for-sale Securities, Fair Value	801.7	672.7
Total fair value measurement of assets	846.9	718.8
Total fair value measurement of liabilities		33.4
Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Foreign exchange forward contracts [Member]
Available-for-sale securities
Derivatives, current and long-term	9.6	18.3
Derivatives, current and long-term	24.4	25.2
Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Interest rate swaps [Member]
Available-for-sale securities
Derivatives, current and long-term	35.6	27.8
Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Cross-currency interest rate swaps [Member]
Available-for-sale securities
Derivatives, current and long-term		8.2
Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Corporate debt securities [Member]
Available-for-sale securities
Available-for-sale Securities, Fair Value	338.5	324.7
Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| U.S. government agencies and debt securities [Member]
Available-for-sale securities
Available-for-sale Securities, Fair Value	215.3	177.2
Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Municipal bonds
Available-for-sale securities
Available-for-sale Securities, Fair Value		1.0
Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Foreign government debt securities [Member]
Available-for-sale securities
Available-for-sale Securities, Fair Value	2.8	6.8
Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Commercial paper [Member]
Available-for-sale securities
Available-for-sale Securities, Fair Value	139.7	74.5
Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member] \| Fair Value, Measurements, Recurring [Member] \| Certificates of deposit [Member]
Available-for-sale securities
Available-for-sale Securities, Fair Value	$ 105.4	$ 88.5

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 Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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