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Investments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jul. 02, 2011 | Jun. 30, 2012 | Jul. 02, 2011 | Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Maturity of investments, maximum (in years) |  |  | 2 years |  |
Amortized cost | $ 143.0 |  | $ 143.0 |  | $ 169.7
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | (0.1) |  | (0.1) |  | (0.1)
Fair value (net carrying amount) | 142.9 |  | 142.9 |  | 169.6
Available-for-sale debt securities [Abstract] |  |  |  |  |
Due in one year or less, amortized cost | 96.5 |  | 96.5 |  | 76.7
Due after one year through two years, amortized cost | 46.5 |  | 46.5 |  | 93.0
Total available-for-sale debt securities, amortized cost | 143.0 |  | 143.0 |  | 169.7
Due in one year or less, fair value (net carrying amount) | 96.4 |  | 96.4 |  | 76.7
Due after one year through two years, fair value (net carrying amount) | 46.5 |  | 46.5 |  | 92.9
Total available-for-sale debt securities, fair value (net carrying amount) | 142.9 |  | 142.9 |  | 169.6
Sales of available-for-sale securities |  |  | 74.2 | 55.3 |
Redemptions of available-for-sale securities |  |  | 74.0 | 24.0 |
Net adjustment to unrealized investment losses on available-for-sale securities | 0.1 | 0 | 0 | (0.1) |
Agency Bonds [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized cost | 46.5 |  | 46.5 |  | 97.7
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | 0 |  | 0 |  | (0.1)
Fair value (net carrying amount) | 46.5 |  | 46.5 |  | 97.6
Corporate Bonds [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized cost | 74.7 |  | 74.7 |  | 51.7
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | (0.1) |  | (0.1) |  | 0
Fair value (net carrying amount) | 74.6 |  | 74.6 |  | 51.7
Commercial Paper [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized cost | 21.0 |  | 21.0 |  | 19.5
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | 0 |  | 0 |  | 0
Fair value (net carrying amount) | 21.0 |  | 21.0 |  | 19.5
U.S. Treasury Bills [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amortized cost | 0.8 |  | 0.8 |  | 0.8
Gross unrealized gains | 0 |  | 0 |  | 0
Gross unrealized losses | 0 |  | 0 |  | 0
Fair value (net carrying amount) | $ 0.8 |  | $ 0.8 |  | $ 0.8

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