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Available-for-Sale-Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Available-for-sale Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] | The following table is a summary of available-for-sale securities recorded in cash and cash equivalents in our Consolidated Balance Sheets (in thousands):
| December 31, 2016 |  | December 31, 2015
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Certificate of deposits | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 249.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 249.0 |
Corporate debt securities | — |  |  | — |  |  | — |  |  | — |  |  | 1,047.2 |  |  | — |  |  | — |  |  | 1,047.2 |
Money market funds | 4,426.8 |  |  | — |  |  | — |  |  | 4,426.8 |  |  | 837.7 |  |  | — |  |  | — |  |  | 837.7 |
Municipal debt securities | — |  |  | — |  |  | — |  |  | — |  |  | 4,740.9 |  |  | 0.8 |  |  | — |  |  | 4,741.7 |
Total | $ | 4,426.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,426.8 |  |  | $ | 6,874.8 |  |  | $ | 0.8 |  |  | $ | — |  |  | $ | 6,875.6 |
Marketable Securities [Table Text Block] | 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):
| December 31, 2016 |  | December 31, 2015
Cash and cash equivalents | $ | 4,426.8 |  |  | $ | 6,875.6 |
Marketable securities | — |  |  | — |
Total | $ | 4,426.8 |  |  | $ | 6,875.6 |
Investments Classified by Contractual Maturity Date [Table Text Block] | The following table summarizes our portfolio of available-for-sale debt securities by contractual maturity (in thousands):
| December 31, 2016
| Amortized Cost |  | Estimated Fair Value
Less than one year | $ | 4,426.8 |  |  | $ | 4,426.8 |
Greater than one year | — |  |  | — |
Total | $ | 4,426.8 |  |  | $ | 4,426.8 |

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