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Fair Value (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Assets: |  |
Cash and cash equivalents | $ 3,796.0 | $ 3,002.2
Short-term investments | 0.4 | 20.6
Available-for-sale securities | 1.4 | 4.3
Foreign currency derivatives | 1.0 | 0.2
Cost method investments | 14.4 | 14.2
Liabilities: |  |
Short-term debt | 11.8 | 28.7
Interest rate and foreign currency derivatives | 39.5 | 48.9
Contingent purchase price obligations | 215.6 | 386.1
Long-term debt, including current portion | 5,056.9 | 5,035.1
Carrying Amount |  |
Assets: |  |
Cash and cash equivalents | 3,796.0 | 3,002.2
Short-term investments | 0.4 | 20.6
Available-for-sale securities | 1.4 | 4.3
Foreign currency derivatives | 1.0 | 0.2
Cost method investments | 14.4 | 14.2
Liabilities: |  |
Short-term debt | 11.8 | 28.7
Interest rate and foreign currency derivatives | 39.5 | 48.9
Contingent purchase price obligations | 215.6 | 386.1
Long-term debt, including current portion | 4,912.9 | 4,920.6
Contingent purchase price obligations |  |
Changes in Contingent Purchase Price Obligations [Roll Forward] |  |
January 1 | 386.1 | 322.0
Acquisitions | 31.9 | 165.3
Revaluation and interest | (27.4) | 18.0
Payments | (187.0) | (103.7)
Foreign currency translation | 12.0 | (15.5)
December 31 | 215.6 | 386.1
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Cash and cash equivalents | 3,796.0 | 3,002.2
Short-term investments | 0.4 | 20.6
Available-for-sale securities | 1.4 | 4.3
Foreign currency derivatives | 1.0 | 0.2
Liabilities: |  |
Interest rate and foreign currency derivatives | 39.5 | 48.9
Contingent purchase price obligations | 215.6 | 386.1
Fair Value, Measurements, Recurring [Member] | Level 1 |  |
Assets: |  |
Cash and cash equivalents | 3,796.0 | 3,002.2
Short-term investments | 0.4 | 20.6
Available-for-sale securities | 1.4 | 4.3
Fair Value, Measurements, Recurring [Member] | Level 2 |  |
Assets: |  |
Foreign currency derivatives | 1.0 | 0.2
Liabilities: |  |
Interest rate and foreign currency derivatives | 39.5 | 48.9
Fair Value, Measurements, Recurring [Member] | Level 3 |  |
Liabilities: |  |
Contingent purchase price obligations | $ 215.6 | $ 386.1

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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