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Investments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | $ 169.7 | $ 105.8 |
Gross unrealized gains | 0 | 0 |
Gross unrealized losses | (0.1) | (0.1) |
Fair value (net carrying amount) | 169.6 | 105.7 |
Available-for-sale debt securities: |  |  |
Due in one year or less, amortized cost | 76.7 | 84.8 |
Due after one year through two years, amortized cost | 93.0 | 21.0 |
Total available-for-sale debt securities, amortized cost | 169.7 | 105.8 |
Due in one year or less, fair value | 76.7 | 84.7 |
Due after one year through two years, fair value | 92.9 | 21.0 |
Total available-for-sale debt securities, fair value | 169.6 | 105.7 |
Maturity of investments, maximum (in years) |  | 2 |
Sales of available-for-sale securities | 125.4 | 0 |
Redemption of available-for-sale securities | 71.5 | 0 |
Net adjustment to Unrealized investment gains (losses) on available-for-sale securities |  | (0.1) |
Equity contributions to other existing joint ventures | 0 | 12.4 | 0.7
Dividends from its unconsolidated affiliates | 0.4 | 2.4 | 0.3
Schedule of Equity Method Investments [Line Items] |  |  |
Equity loss in the Consolidated Statements of Operations | (4.7) | (3.0) | (15.7)
Joint Venture [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity loss in the Consolidated Statements of Operations | (3.8) |  |
US Government Agencies Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 97.7 | 31.0 |
Gross unrealized gains | 0 | 0 |
Gross unrealized losses | (0.1) | 0 |
Fair value (net carrying amount) | 97.6 | 31.0 |
Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 51.7 | 44.5 |
Gross unrealized gains | 0 | 0 |
Gross unrealized losses | 0 | (0.1) |
Fair value (net carrying amount) | 51.7 | 44.4 |
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 19.5 | 29.5 |
Gross unrealized gains | 0 | 0 |
Gross unrealized losses | 0 | 0 |
Fair value (net carrying amount) | 19.5 | 29.5 |
US Treasury Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 0.8 | 0.8 |
Gross unrealized gains | 0 | 0 |
Gross unrealized losses | 0 | 0 |
Fair value (net carrying amount) | $ 0.8 | $ 0.8 |

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