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3. Fair Value Measurements (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity Securities, FV-NI, Unrealized Gain |  | $ 607.7 |  |
Debt Securities, Available-for-sale |  | 373.2 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Restricted Investments, at Fair Value |  | 5.6 | $ 5.6 |
Available-for-sale Securities |  | 373.2 | 1,301.4 | [1]
Equity Securities, FV-NI |  | 2,672.9 |  |
Debt Securities, Available-for-sale |  | 373.2 |  |
Forward foreign exchange contracts, Asset | [2] | 0.6 | 0.5 |
Financial Assets Carried at Fair Value |  | 3,200.0 | 1,411.8 |
Forward foreign exchange contracts, Liability | [3] | 0.7 | 1.6 |
Business Combination, Contingent Consideration, Liability | [4] | 8.4 | 16.7 |
Liabilities, Fair Value Disclosure |  | 9.1 | 18.3 |
Fair Value, Measurements, Recurring [Member] | Interest-bearing Deposits [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities |  |  | 0.7 |
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 185.7 |
Debt Securities, Available-for-sale |  | 215.0 |  |
Fair Value, Measurements, Recurring [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 67.6 |
Debt Securities, Available-for-sale |  | 80.3 |  |
Fair Value, Measurements, Recurring [Member] | Foreign Government Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 3.4 |
Debt Securities, Available-for-sale |  | 3.6 |  |
Fair Value, Measurements, Recurring [Member] | Municipal Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 15.0 |
Debt Securities, Available-for-sale |  | 11.0 |  |
Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 973.4 |
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 55.6 |
Debt Securities, Available-for-sale |  | 63.3 |  |
Fair Value, Measurements, Recurring [Member] | Time Deposits [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 32.7 | 53.7 |
Fair Value, Measurements, Recurring [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents |  |  | 11.2 |
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 36.9 | 3.4 |
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 77.8 | 36.0 |
Fair Value, Measurements, Recurring [Member] | Cash Equivalents [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 147.7 | 104.3 |
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents |  | 0.3 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Restricted Investments, at Fair Value |  | 5.6 | 5.6 |
Available-for-sale Securities | [1] |  | 973.4 |
Equity Securities, FV-NI |  | 2,672.9 |  |
Debt Securities, Available-for-sale |  | 0.0 |  |
Forward foreign exchange contracts, Asset | [2] | 0.0 | 0.0 |
Financial Assets Carried at Fair Value |  | 2,738.1 | 1,026.1 |
Forward foreign exchange contracts, Liability | [3] | 0.0 | 0.0 |
Business Combination, Contingent Consideration, Liability | [4] | 0.0 | 0.0 |
Liabilities, Fair Value Disclosure |  | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest-bearing Deposits [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities |  |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 0.0 |
Debt Securities, Available-for-sale |  | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 0.0 |
Debt Securities, Available-for-sale |  | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 0.0 |
Debt Securities, Available-for-sale |  | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 0.0 |
Debt Securities, Available-for-sale |  | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Marketable Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 973.4 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 0.0 |
Debt Securities, Available-for-sale |  | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Time Deposits [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 22.7 | 43.7 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents |  |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 36.9 | 3.4 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cash Equivalents [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 59.6 | 47.1 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents |  | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Restricted Investments, at Fair Value |  | 0.0 | 0.0 |
Available-for-sale Securities | [1] |  | 328.0 |
Equity Securities, FV-NI |  | 0.0 |  |
Debt Securities, Available-for-sale |  | 373.2 |  |
Forward foreign exchange contracts, Asset | [2] | 0.6 | 0.5 |
Financial Assets Carried at Fair Value |  | 461.9 | 385.7 |
Forward foreign exchange contracts, Liability | [3] | 0.7 | 1.6 |
Business Combination, Contingent Consideration, Liability | [4] | 0.0 | 0.0 |
Liabilities, Fair Value Disclosure |  | 0.7 | 1.6 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest-bearing Deposits [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities |  |  | 0.7 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 185.7 |
Debt Securities, Available-for-sale |  | 215.0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 67.6 |
Debt Securities, Available-for-sale |  | 80.3 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 3.4 |
Debt Securities, Available-for-sale |  | 3.6 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 15.0 |
Debt Securities, Available-for-sale |  | 11.0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Marketable Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 55.6 |
Debt Securities, Available-for-sale |  | 63.3 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Time Deposits [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 10.0 | 10.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents |  |  | 11.2 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 77.8 | 36.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Equivalents [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 88.1 | 57.2 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents |  | 0.3 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Restricted Investments, at Fair Value |  | 0.0 | 0.0 |
Available-for-sale Securities | [1] |  | 0.0 |
Equity Securities, FV-NI |  | 0.0 |  |
Debt Securities, Available-for-sale |  | 0.0 |  |
Forward foreign exchange contracts, Asset | [2] | 0.0 | 0.0 |
Financial Assets Carried at Fair Value |  | 0.0 | 0.0 |
Forward foreign exchange contracts, Liability | [3] | 0.0 | 0.0 |
Business Combination, Contingent Consideration, Liability | [4] | 8.4 | 16.7 |
Liabilities, Fair Value Disclosure |  | 8.4 | 16.7 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest-bearing Deposits [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities |  |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 0.0 |
Debt Securities, Available-for-sale |  | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 0.0 |
Debt Securities, Available-for-sale |  | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 0.0 |
Debt Securities, Available-for-sale |  | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 0.0 |
Debt Securities, Available-for-sale |  | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Marketable Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities | [1] |  | 0.0 |
Debt Securities, Available-for-sale |  | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Time Deposits [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents |  |  | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cash Equivalents [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | [5] | 0.0 | 0.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents |  | 0.0 |  |
Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 3.2 | 2.7 |
Short-term Investments [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities |  | 373.0 | 371.2 |
Equity Securities, FV-NI |  | 40.2 |  |
Short-term Investments [Member] | Fair Value, Measurements, Recurring [Member] | Interest-bearing Deposits [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities |  |  | 0.7 |
Short-term Investments [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities |  |  | 185.7 |
Debt Securities, Available-for-sale |  | 215.0 |  |
Short-term Investments [Member] | Fair Value, Measurements, Recurring [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities |  |  | 67.6 |
Debt Securities, Available-for-sale |  | 80.3 |  |
Short-term Investments [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Government Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities |  |  | 3.4 |
Debt Securities, Available-for-sale |  | 3.6 |  |
Short-term Investments [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities |  |  | 15.0 |
Debt Securities, Available-for-sale |  | 11.0 |  |
Short-term Investments [Member] | Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities |  |  | 43.4 |
Short-term Investments [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities |  |  | 55.4 |
Debt Securities, Available-for-sale |  | 63.1 |  |
Other Investments [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities |  | 0.2 | 930.2 |
Equity Securities, FV-NI |  | 2,632.7 |  |
Other Noncurrent Liabilities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability |  | $ 5.2 | $ 14.0 |
[1] | Available-for-sale investments are included in the following accounts in the Consolidated Balance Sheets (in millions):
| December 31, 2018 |  | December 31, 2017
Short-term investments | $ | 373.0 |  |  | $ | 371.2 |
Other investments | 0.2 |  |  | 930.2 |
Total | $ | 373.2 |  |  | $ | 1,301.4 |
[2] | Forward foreign exchange contracts in an asset position are included in Other current assets in the Consolidated Balance Sheets.
[3] | Forward foreign exchange contracts in a liability position are included in Other current liabilities in the Consolidated Balance Sheets.
[4] | Contingent consideration liabilities are included in the following accounts in the Consolidated Balance Sheets (in millions):
| December 31, 2018 |  | December 31, 2017
Other current liabilities | $ | 3.2 |  |  | $ | 2.7 |
Other long-term liabilities | 5.2 |  |  | 14.0 |
Total | $ | 8.4 |  |  | $ | 16.7 |
[5] |
(a) | Cash equivalents are included in Cash and cash equivalents in the Consolidated Balance Sheets.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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