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Available-for-Sale-Securities | 3 Months Ended
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Mar. 31, 2017
Available-for-sale Securities [Abstract] |
Cash, Cash Equivalents, and Marketable Securities [Text Block] | Available-for-Sale-Securities The following table is a summary of available-for-sale securities recorded in cash and cash equivalents or marketable securities in our Consolidated Balance Sheets (in thousands):
| March 31, 2017 |  | December 31, 2016
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Money market funds | $ | 1,430.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,430.4 |  |  | $ | 4,426.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,426.8 |
Municipal debt securities | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total | $ | 1,430.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,430.4 |  |  | $ | 4,426.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,426.8 |
Estimated fair values of available-for-sale securities are generally based on prices obtained from commercial pricing services. The following table summarizes the classification of the available-for-sale debt securities on our Consolidated Balance Sheets (in thousands):
| March 31, 2017 |  | December 31, 2016
Cash and cash equivalents | $ | 1,430.4 |  |  | $ | 4,426.8 |
Total | $ | 1,430.4 |  |  | $ | 4,426.8 |
The following table summarizes our portfolio of available-for-sale debt securities by contractual maturity (in thousands):
| March 31, 2017
| Amortized Cost |  | Estimated Fair Value
Less than one year | $ | 1,430.4 |  |  | $ | 1,430.4 |
Greater than one year | — |  |  | — |
Total | $ | 1,430.4 |  |  | $ | 1,430.4 |

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- References No definition available. + Details
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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References No definition available. + Details
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