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Fair Value Measurements, Equity Investments and Other Financial Instruments - Equity Investment Without Readily Determinable Fair Value (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) investment | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Equity Securities without Readily Determinable Fair Value [Roll Forward] |  |  |  |  |
Carrying amount at the beginning of period |  |  | $ 25.4 | $ 7.5 | $ 7.5
Purchases |  |  | 14.7 |  | 2.6
Impairments or downward adjustments |  |  | 0.0 |  | 0.0
Upward adjustments |  |  | 0.0 |  | 15.1
Currency translation on investments |  |  | (0.3) |  | 0.2
Carrying amount at the end of period | $ 39.8 | $ 25.4 | 39.8 |  | 25.4
Cumulative upward adjustment | 15.1 | $ 15.1 | 15.1 |  | $ 15.1
Number of investments | investment |  | 1 |  |  |
Additional investment | $ 9.0 | $ 5.7 | $ 15.0 | $ 0.0 |

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- Definition Equity Securities without Readily Determinable Fair Value + References No definition available. + Details
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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
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- Definition Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
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- Definition Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
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- Definition Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
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