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Summary of Significant Accounting Policies (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Summary of Significant Accounting Policies |  |
Cash and cash equivalents | The following represents the Company’s cash, cash equivalents and restricted cash as of September 30, 2020 and December 31, 2019 ($ in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | September 30, | ​ | December 31,
​ |  | 2020 |  | 2019
Cash and cash equivalents | ​ | $ | 575.4 | ​ | $ | 270.0
Restricted cash | ​ |  | 0.3 | ​ |  | 0.3
Total cash, cash equivalents and restricted cash | ​ | $ | 575.7 | ​ | $ | 270.3
| The following represents the Company’s cash, cash equivalents and restricted cash as of December 31, 2018 and 2019 ($ in millions). ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2018 |  | 2019
Cash and cash equivalents | ​ | $ | 102.2 | ​ | $ | 270.0
Restricted cash | ​ |  | 0.2 | ​ |  | 0.3
Total cash, cash equivalents and restricted cash | ​ | $ | 102.4 | ​ | $ | 270.3
Restricted cash | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | September 30, | ​ | December 31,
​ |  | 2020 |  | 2019
Cash and cash equivalents | ​ | $ | 575.4 | ​ | $ | 270.0
Restricted cash | ​ |  | 0.3 | ​ |  | 0.3
Total cash, cash equivalents and restricted cash | ​ | $ | 575.7 | ​ | $ | 270.3
| ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2018 |  | 2019
Cash and cash equivalents | ​ | $ | 102.2 | ​ | $ | 270.0
Restricted cash | ​ |  | 0.2 | ​ |  | 0.3
Total cash, cash equivalents and restricted cash | ​ | $ | 102.4 | ​ | $ | 270.3
Property and equipment useful life |  | Property and equipment are stated at cost, net of accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful life of the assets at the following rates: ​
​ | ​ | ​
​ |  | Years
Computers and electronic equipment |  | 3
Furniture and equipment |  | 6
Leasehold improvements |  | Shorter of lease term / useful life

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- Definition Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, deprecation expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167750&loc=d3e42232-110370 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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