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Acquisitions and Strategic Investments (Periscope) (Details) - USD ($) $ in Millions | Jan. 03, 2019 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 103.0 | $ 103.0
Periscope Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Cash paid for acquisition | $ 121.0 |  |
Preliminary purchase price | 134.0 |  |
Acquired cash | 9.8 |  |
Non-cash equity incentive awards | 3.2 |  |
Identifiable finite-lived intangibles acquired | 69.8 |  |
Goodwill | 58.5 |  |
Goodwill, tax deductible portion | $ 52.7 |  |
Minimum | Periscope Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible assets useful life | 5 years |  |
Maximum | Periscope Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible assets useful life | 6 years |  |

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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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