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2. Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions | Jun. 30, 2011 | Dec. 31, 2010
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | $ 339.2 |  | $ 211.8 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 160.7 | [1] | 283.0 | [1]
Available-for-sale investments | 130.8 | [2] | 102.2 | [2]
Forward foreign exchange contracts | 0 | [3] | 0 | [3]
Financial Assets Carried at Fair Value | 291.5 |  | 385.2 |
Forward foreign exchange contracts | 0 | [4] | 0 | [4]
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 0 | [1] | 0 | [1]
Fair Value, Inputs, Level 1 [Member] | Bonds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 0 | [1] |  |
Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 0 | [1] |  |
Fair Value, Inputs, Level 1 [Member] | Bank Time Deposits [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 31.5 | [1] | 16.7 | [1]
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 129.2 | [1] | 266.3 | [1]
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 0 | [2] | 0 | [2]
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 0 | [2] |  |
Fair Value, Inputs, Level 1 [Member] | US Government and Government Agencies and Authorities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 0 | [2] | 0 | [2]
Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 0 | [2] | 0 | [2]
Fair Value, Inputs, Level 1 [Member] | Municipal Bonds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 0 | [2] | 0 | [2]
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 130.8 | [2] | 102.2 | [2]
Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 0 | [2] |  |
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Backed Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments |  |  | 0 | [2]
Fair Value, Inputs, Level 1 [Member] | Mortgage Backed Securities, Other [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments |  |  | 0 | [2]
Fair Value, Inputs, Level 1 [Member] | Other Debt Obligations [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments |  |  | 0 | [2]
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 127.5 | [1] | 204.6 | [1]
Available-for-sale investments | 208.4 | [2] | 109.6 | [2]
Forward foreign exchange contracts | 0.7 | [3] | 0.5 | [3]
Financial Assets Carried at Fair Value | 336.6 |  | 314.7 |
Forward foreign exchange contracts | 6.7 | [4] | 3.3 | [4]
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 107.7 | [1] | 179.6 | [1]
Fair Value, Inputs, Level 2 [Member] | Bonds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 4.8 | [1] |  |
Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 10.0 | [1] |  |
Fair Value, Inputs, Level 2 [Member] | Bank Time Deposits [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 5.0 | [1] | 25.0 | [1]
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 0 | [1] | 0 | [1]
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 173.2 | [2] | 39.8 | [2]
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 11.8 | [2] |  |
Fair Value, Inputs, Level 2 [Member] | US Government and Government Agencies and Authorities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 14.3 | [2] | 54.7 | [2]
Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 2.1 | [2] | 4.5 | [2]
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 5.1 | [2] | 7.7 | [2]
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 0 | [2] | 0 | [2]
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 1.9 | [2] |  |
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments |  |  | 0.1 | [2]
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities, Other [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments |  |  | 2.5 | [2]
Fair Value, Inputs, Level 2 [Member] | Other Debt Obligations [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments |  |  | 0.3 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 288.2 | [1] | 487.6 | [1]
Available-for-sale investments | 339.2 | [2] | 211.8 | [2]
Forward foreign exchange contracts | 0.7 | [3] | 0.5 | [3]
Financial Assets Carried at Fair Value | 628.1 |  | 699.9 |
Forward foreign exchange contracts | 6.7 | [4] | 3.3 | [4]
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial Paper [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 107.7 | [1] | 179.6 | [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Bonds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 4.8 | [1] |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Government Debt Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 10.0 | [1] |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Bank Time Deposits [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 36.5 | [1] | 41.7 | [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Money Market Funds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash equivalents | 129.2 | [1] | 266.3 | [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Debt Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 173.2 | [2] | 39.8 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Certificates of Deposit [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 11.8 | [2] |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | US Government and Government Agencies and Authorities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 14.3 | [2] | 54.7 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Government Debt Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 2.1 | [2] | 4.5 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal Bonds [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 5.1 | [2] | 7.7 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 130.8 | [2] | 102.2 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 1.9 | [2] |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Collateralized Mortgage Backed Securities [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments |  |  | 0.1 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Mortgage Backed Securities, Other [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments |  |  | 2.5 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Other Debt Obligations [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments |  |  | 0.3 | [2]
Estimate of Fair Value, Fair Value Disclosure [Member] | Short-term Investments [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | 215.9 |  | 118.6 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Other Assets [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale investments | $ 123.3 |  | $ 93.2 |
[1] | Cash equivalents are included in Cash and cash equivalents in the Condensed Consolidated Balance Sheets.
[2] | Available-for-sale investments (in millions): June 30, 2011 December 31, 2010 Short-term investments$215.9 $118.6Other assets123.3 93.2Total$339.2 $211.8
[3] | Forward foreign exchange contracts in an asset position are included in Prepaid expenses, taxes and other current assets in the Condensed Consolidated Balance Sheets.
[4] | Forward foreign exchange contracts in a liability position are included in Other current liabilities in the Condensed Consolidated Balance Sheets.

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition 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 includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 8, 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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 contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date. + Details
Name: | us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition 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 contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date. + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant