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Investments (Tables) | 9 Months Ended
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Sep. 29, 2012
Investments [Abstract] |
Schedule of Available-for-sale Securities | The following is a summary of the Company’s available-for-sale securities as of September 29, 2012:
(in millions) | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value (net carrying amount)
Agency Bonds | $ | 47.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 47.6 |
Corporate Bonds | 73.7 |  |  | — |  |  | — |  |  | 73.7 |
Commercial Paper | 23.0 |  |  | — |  |  | — |  |  | 23.0 |
U.S. Treasury Bills | 0.8 |  |  | — |  |  | — |  |  | 0.8 |
Total available-for-sale securities | $ | 145.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 145.1 |
The following is a summary of the Company’s available-for-sale securities as of December 31, 2011:
(in millions) | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value (net carrying amount)
Agency Bonds | $ | 97.7 |  |  | $ | — |  |  | $ | (0.1 | ) |  | $ | 97.6 |
Corporate Bonds | 51.7 |  |  | — |  |  | — |  |  | 51.7 |
Commercial Paper | 19.5 |  |  | — |  |  | — |  |  | 19.5 |
U.S. Treasury Bills | 0.8 |  |  | — |  |  | — |  |  | 0.8 |
Total available-for-sale securities | $ | 169.7 |  |  | $ | — |  |  | $ | (0.1 | ) |  | $ | 169.6 |
The net carrying value and estimated fair value of debt securities at September 29, 2012, by contractual maturity, are shown below:
(in millions) | Amortized cost |  | Fair value (net carrying amount)
Available-for-sale debt securities: |  |  |
Due in one year or less | $ | 97.5 |  |  | $ | 97.5 |
Due after one year through two years | 47.6 |  |  | 47.6 |
Total available-for-sale debt securities | $ | 145.1 |  |  | $ | 145.1 |
The net carrying value and estimated fair value of debt securities at December 31, 2011, by contractual maturity, are shown below:
(in millions) | Amortized cost |  | Fair value (net carrying amount)
Available-for-sale debt securities: |  |  |
Due in one year or less | $ | 76.7 |  |  | $ | 76.7 |
Due after one year through two years | 93.0 |  |  | 92.9 |
Total available-for-sale debt securities | $ | 169.7 |  |  | $ | 169.6 |

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- Definition Tabular disclosure of 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, 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 -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, 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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 + Details
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