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Investments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 28, 2013 | Sep. 29, 2012 | Sep. 28, 2013 | Sep. 29, 2012 | Dec. 31, 2012
Schedule of Investments [Line Items] |  |  |  |  |
Maturity Of Investments, Maximum |  |  | 2 years |  |
Amortized cost | $ 22.3 |  | $ 22.3 |  | $ 144.4
Gross Unrealized Gains, Available-for-sale Securities | 0 |  | 0 |  | 0
Gross Unrealized Losses, Available-for-sale Securities | 0 |  | 0 |  | 0
Fair value (net carrying amount) | 22.3 |  | 22.3 |  | 144.4
Available-for-sale debt securities [Abstract] |  |  |  |  |
Due in one year or less, amortized cost | 22.3 |  | 22.3 |  | 92.3
Due after one year through two years, amortized cost |  |  |  |  | 52.1
Total available-for-sale debt securities, amortized cost | 22.3 |  | 22.3 |  | 144.4
Due in one year or less, fair value (net carrying amount) | 22.3 |  | 22.3 |  | 92.3
Due after one year through two years, fair value (net carrying amount) |  |  |  |  | 52.1
Total available-for-sale debt securities, fair value (net carrying amount) | 22.3 |  | 22.3 |  | 144.4
Redemptions of available-for-sale securities |  |  | 107.4 | 137.7 |
Sales of available-for-sale securities |  |  | 35.7 | 41.9 |
Net adjustment to unrealized investment losses on available-for-sale securities | 0 | 0.1 | 0 | 0.1 |
Agency Bonds [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Amortized cost |  |  |  |  | 59.2
Gross Unrealized Gains, Available-for-sale Securities |  |  |  |  | 0
Gross Unrealized Losses, Available-for-sale Securities |  |  |  |  | 0
Fair value (net carrying amount) |  |  |  |  | 59.2
Corporate Bonds [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Amortized cost | 21.5 |  | 21.5 |  | 66.4
Gross Unrealized Gains, Available-for-sale Securities | 0 |  | 0 |  | 0
Gross Unrealized Losses, Available-for-sale Securities | 0 |  | 0 |  | 0
Fair value (net carrying amount) | 21.5 |  | 21.5 |  | 66.4
Commercial Paper [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Amortized cost |  |  |  |  | 16.0
Gross Unrealized Gains, Available-for-sale Securities |  |  |  |  | 0
Gross Unrealized Losses, Available-for-sale Securities |  |  |  |  | 0
Fair value (net carrying amount) |  |  |  |  | 16.0
Certificate of Deposit [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Amortized cost |  |  |  |  | 2.0
Gross Unrealized Gains, Available-for-sale Securities |  |  |  |  | 0
Gross Unrealized Losses, Available-for-sale Securities |  |  |  |  | 0
Fair value (net carrying amount) |  |  |  |  | 2.0
U.S. Treasury Bills [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Amortized cost | 0.8 |  | 0.8 |  | 0.8
Gross Unrealized Gains, Available-for-sale Securities | 0 |  | 0 |  | 0
Gross Unrealized Losses, Available-for-sale Securities | 0 |  | 0 |  | 0
Fair value (net carrying amount) | $ 0.8 |  | $ 0.8 |  | $ 0.8

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