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3. Fair Value Measurements Fair Value Level Table (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Jan. 06, 2016 | Dec. 31, 2015
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Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Restricted Investments, at Fair Value |  | $ 4.2 |  | $ 4.2
Available-for-sale Securities, Fair Value Disclosure | [1] | 1,090.8 |  | 957.6
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [2] | 0.6 |  | 0.9
Assets, Fair Value Disclosure |  | 1,169.6 |  | 1,034.3
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [3] | 1.4 |  | 1.1
Business Combination, Contingent Consideration, Liability | [4] | 43.0 |  | 19.1
Liabilities, Fair Value Disclosure |  | 44.4 |  | 20.2
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 |  | 4.2 |  | 4.2
Available-for-sale Securities, Fair Value Disclosure | [1] | 751.4 |  | 660.1
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [2] | 0.0 |  | 0.0
Assets, Fair Value Disclosure |  | 801.8 |  | 687.5
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [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 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, Fair Value Disclosure | [1] | 339.4 |  | 297.5
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [2] | 0.6 |  | 0.9
Assets, Fair Value Disclosure |  | 367.8 |  | 346.8
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [3] | 1.4 |  | 1.1
Business Combination, Contingent Consideration, Liability | [4] | 0.0 |  | 0.0
Liabilities, Fair Value Disclosure |  | 1.4 |  | 1.1
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, Fair Value Disclosure | [1] | 0.0 |  | 0.0
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure | [2] | 0.0 |  | 0.0
Assets, Fair Value Disclosure |  | 0.0 |  | 0.0
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure | [3] | 0.0 |  | 0.0
Business Combination, Contingent Consideration, Liability | [4] | 43.0 |  | 19.1
Liabilities, Fair Value Disclosure |  | 43.0 |  | 19.1
US Government Sponsored Agencies [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 5.0 |  | 14.6
US Government Sponsored Agencies [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  | 0.0
US Government Sponsored Agencies [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 5.0 |  | 14.6
US Government Sponsored Agencies [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  | 0.0
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 21.0 |  | 33.2
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  | 0.0
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 21.0 |  | 33.2
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  | 0.0
Foreign Government Obligations [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 1.8 |  | 0.6
Foreign Government Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  | 0.0
Foreign Government Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 1.8 |  | 0.6
Foreign Government Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  | 0.0
Foreign Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 21.1 |  | 11.9
Foreign Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 21.1 |  | 11.9
Foreign Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  | 0.0
Foreign Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  | 0.0
Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 20.0 |  |
Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 20.0 |  |
Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  |
Certificates of Deposit [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  |
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 5.1 |  | 11.3
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 5.1 |  | 11.3
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  | 0.0
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  | 0.0
Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 74.0 |  | 71.6
Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 46.2 |  | 23.2
Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 27.8 |  | 48.4
Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  | 0.0
Marketable Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 751.4 |  | 660.1
Marketable Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 751.4 |  | 660.1
Marketable Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 0.0 |  | 0.0
Marketable Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 0.0 |  | 0.0
Municipal Obligations (Member) | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 10.6 |  | 6.4
Municipal Obligations (Member) | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 0.0 |  | 0.0
Municipal Obligations (Member) | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 10.6 |  | 6.4
Municipal Obligations (Member) | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 0.0 |  | 0.0
Foreign Government Obligations [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 6.7 |  | 4.6
Foreign Government Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 0.0 |  | 0.0
Foreign Government Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 6.7 |  | 4.6
Foreign Government Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 0.0 |  | 0.0
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 175.2 |  | 156.9
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 0.0 |  | 0.0
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 175.2 |  | 156.9
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 0.0 |  | 0.0
US Government Sponsored Agencies [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 79.4 |  | 74.8
US Government Sponsored Agencies [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 0.0 |  | 0.0
US Government Sponsored Agencies [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 79.4 |  | 74.8
US Government Sponsored Agencies [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 0.0 |  | 0.0
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 67.5 |  | 54.8
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 0.0 |  | 0.0
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 67.5 |  | 54.8
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | [1] | 0.0 |  | 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 |  | 13.7 |  | 13.5
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 |  | 29.3 |  | 5.6
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, Fair Value Disclosure |  | 372.9 |  | 328.7
Short-term Investments [Member] | Marketable Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 33.8 |  | 31.4
Short-term Investments [Member] | Municipal Obligations (Member) | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 10.6 |  | 6.4
Short-term Investments [Member] | Foreign Government Obligations [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 6.7 |  | 4.6
Short-term Investments [Member] | Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 175.2 |  | 156.9
Short-term Investments [Member] | US Government Sponsored Agencies [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 79.4 |  | 74.8
Short-term Investments [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  | 67.2 |  | 54.6
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, Fair Value Disclosure |  | 717.9 |  | $ 628.9
Analytical Flow Cytometer Platform [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 29.3 | $ 29.3 |
Sales milestone minimum amount [Member] | Analytical Flow Cytometer Platform [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low |  | $ 0.0 |  |
[1] | Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): June 30, 2016 December 31, 2015Short-term investments$372.9 $328.7Other investments717.9 628.9Total$1,090.8 $957.6
[2] | Forward foreign exchange contracts in an asset position are included in Other current assets in the Condensed Consolidated Balance Sheets.
[3] | Forward foreign exchange contracts in a liability position are included in Other current liabilities in the Condensed Consolidated Balance Sheets.
[4] | Contingent consideration liability is included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): June 30, 2016 December 31, 2015Other current liabilities$13.7 $13.5Other long-term liabilities29.3 5.6 Total$43.0 $19.1
[5] | Cash equivalents are included in Cash and cash equivalents in the Condensed 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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