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Fair Value Of Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Earn-out Arrangements [Member] | Dec. 31, 2012 Earn-out Arrangements [Member] | Mar. 31, 2013 Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Dec. 31, 2012 Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Mar. 31, 2013 Auction Rate Securities [Member] | Dec. 31, 2012 Auction Rate Securities [Member] | Mar. 31, 2013 Carrying Amount [Member] | Dec. 31, 2012 Carrying Amount [Member] | Mar. 31, 2013 Carrying Amount [Member] Senior Notes [Member] Unsecured Debt [Member] 4.875% Senior Notes [Member] | Dec. 02, 2012 Carrying Amount [Member] Senior Notes [Member] Unsecured Debt [Member] 4.875% Senior Notes [Member] | Mar. 31, 2013 Carrying Amount [Member] Senior Notes [Member] Unsecured Debt [Member] 7.625% Senior Notes [Member] | Dec. 31, 2012 Carrying Amount [Member] Senior Notes [Member] Unsecured Debt [Member] 7.625% Senior Notes [Member] | Mar. 31, 2013 Carrying Amount [Member] Convertible Debt [Member] Original 4.0% Notes [Member] | Dec. 31, 2012 Carrying Amount [Member] Convertible Debt [Member] Original 4.0% Notes [Member] | Mar. 31, 2013 Carrying Amount [Member] Convertible Debt [Member] Original 4.25% Notes [Member] | Dec. 31, 2012 Carrying Amount [Member] Convertible Debt [Member] Original 4.25% Notes [Member] | Mar. 31, 2013 Carrying Amount [Member] Convertible Debt [Member] New 4.0% Notes [Member] | Dec. 31, 2012 Carrying Amount [Member] Convertible Debt [Member] New 4.0% Notes [Member] | Mar. 31, 2013 Carrying Amount [Member] Convertible Debt [Member] New 4.25% Notes [Member] | Dec. 31, 2012 Carrying Amount [Member] Convertible Debt [Member] New 4.25% Notes [Member] | Mar. 31, 2013 Carrying Amount [Member] Earn-out Arrangements [Member] | Dec. 31, 2012 Carrying Amount [Member] Earn-out Arrangements [Member] | Mar. 31, 2013 Carrying Amount [Member] Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Dec. 31, 2012 Carrying Amount [Member] Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Mar. 31, 2013 Carrying Amount [Member] Auction Rate Securities [Member] | Dec. 31, 2012 Carrying Amount [Member] Auction Rate Securities [Member] | Mar. 31, 2013 Fair Value [Member] | Dec. 31, 2012 Fair Value [Member] | Mar. 31, 2013 Fair Value [Member] Senior Notes [Member] Unsecured Debt [Member] 4.875% Senior Notes [Member] | Dec. 02, 2012 Fair Value [Member] Senior Notes [Member] Unsecured Debt [Member] 4.875% Senior Notes [Member] | Mar. 31, 2013 Fair Value [Member] Senior Notes [Member] Unsecured Debt [Member] 7.625% Senior Notes [Member] | Dec. 31, 2012 Fair Value [Member] Senior Notes [Member] Unsecured Debt [Member] 7.625% Senior Notes [Member] | Mar. 31, 2013 Fair Value [Member] Convertible Debt [Member] Original 4.0% Notes [Member] | Dec. 31, 2012 Fair Value [Member] Convertible Debt [Member] Original 4.0% Notes [Member] | Mar. 31, 2013 Fair Value [Member] Convertible Debt [Member] Original 4.25% Notes [Member] | Dec. 31, 2012 Fair Value [Member] Convertible Debt [Member] Original 4.25% Notes [Member] | Mar. 31, 2013 Fair Value [Member] Convertible Debt [Member] New 4.0% Notes [Member] | Dec. 31, 2012 Fair Value [Member] Convertible Debt [Member] New 4.0% Notes [Member] | Mar. 31, 2013 Fair Value [Member] Convertible Debt [Member] New 4.25% Notes [Member] | Dec. 31, 2012 Fair Value [Member] Convertible Debt [Member] New 4.25% Notes [Member] | Mar. 31, 2013 Fair Value [Member] Earn-out Arrangements [Member] | Dec. 31, 2012 Fair Value [Member] Earn-out Arrangements [Member] | Mar. 31, 2013 Fair Value [Member] Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Dec. 31, 2012 Fair Value [Member] Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Mar. 31, 2013 Fair Value [Member] Auction Rate Securities [Member] | Dec. 31, 2012 Fair Value [Member] Auction Rate Securities [Member]
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash surrender value of life insurance policies | $ 12.8 | $ 11.9 |  |  |  |  |  |  |  |  | $ 12.8 | $ 11.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.8 | $ 11.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  | 14.8 | [1] | 14.4 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.8 | 14.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.8 | 14.4
Liabilities measured on a recurring basis |  |  | 142.6 | 143.6 | 3.9 | 3.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 142.6 | 143.6 | 3.9 | 3.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 142.6 | 143.6 | 3.9 | 3.3 |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  |  | 400.0 | 0 | 0 | 150.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 397.0 | 0 | 0 | 154.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.6 | $ 9.7 | $ 3.0 | $ 3.0 | $ 101.6 | $ 100.9 | $ 92.7 | $ 92.1 |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.1 | $ 15.9 | $ 5.8 | $ 5.1 | $ 103.4 | $ 101.5 | $ 94.8 | $ 92.7 |  |  |  |  |  |
[1] | The Company’s auction rate securities maintain split ratings. For purposes of this table, securities are categorized according to their lowest rating.

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- 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: 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 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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- 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 element represents the portion of a 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 the amount that could be realized under a life insurance contract or contracts owned by the Company as of the date of the statement of financial position. Such Company-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Surrender Value -URI http://asc.fasb.org/extlink&oid=6507153 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 88-5 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Technical Bulletin (FTB) -Number 85-4 -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
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- Definition This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a -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 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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