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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Property, Plant and Equipment | Property and equipment consisted of the following:
|  | Estimated Useful Lives |  | December 31,
|  | 2020 |  | 2019
Computer equipment |  | 3 years |  | $ | 464.1 |  |  | $ | 434.8 |
Software |  | 3-5 years |  | 64.8 |  |  | 55.9 |
Land |  | Indefinite |  | 9.0 |  |  | 9.0 |
Buildings, including improvements |  | 5-40 years |  | 146.6 |  |  | 145.5 |
Leasehold improvements |  | Lesser of useful life or remaining lease term |  | 98.2 |  |  | 99.4 |
Other |  | 1-20 years |  | 27.0 |  |  | 25.7 |
Total property and equipment |  |  |  | 809.7 |  |  | 770.3 |
Less: accumulated depreciation and amortization |  |  |  | (552.4) |  |  | (511.7) |
Property and equipment, net |  |  |  | $ | 257.3 |  |  | $ | 258.6 |
Finite-Lived Intangible Assets | Finite-lived intangible assets are amortized over the following estimated useful lives:
Customer relationships | 2-9 years
Developed technology | 3-7 years
Trade names and other | 1-10 years
Intangible assets, net are summarized as follows:
| December 31, 2020
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Indefinite-lived intangible assets: |  |  |  |  |
Trade names and branding | $ | 445.0 |  |  | n/a |  | $ | 445.0 |
Domain portfolio | 250.3 |  |  | n/a |  | 250.3 |
Contractual-based assets | 67.0 |  |  | n/a |  | 67.0 |
Finite-lived intangible assets: |  |  |  |  |
Customer-related | 857.0 |  |  | $ | (534.7) |  |  | 322.3 |
Developed technology | 188.1 |  |  | (90.7) |  |  | 97.4 |
Trade names and other | 106.9 |  |  | (33.8) |  |  | 73.1 |
| $ | 1,914.3 |  |  | $ | (659.2) |  |  | $ | 1,255.1 |
| December 31, 2019
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Indefinite-lived intangible assets: |  |  |  |  |
Trade names and branding | $ | 445.0 |  |  | n/a |  | $ | 445.0 |
Domain portfolio | 148.1 |  |  | n/a |  | 148.1 |
Finite-lived intangible assets: |  |  |  |  |
Customer-related | 838.4 |  |  | $ | (475.6) |  |  | 362.8 |
Developed technology | 151.5 |  |  | (67.3) |  |  | 84.2 |
Trade names and other | 81.4 |  |  | (23.8) |  |  | 57.6 |
| $ | 1,664.4 |  |  | $ | (566.7) |  |  | $ | 1,097.7 |
Weighted-Average Assumptions Used in Estimating the Fair Value of Stock Options Granted | The fair value of stock options granted was estimated using the following weighted-average assumptions:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Expected term (in years) | 6.0 |  | 6.1 |  | 6.1
Expected volatility | 32.3 | % |  | 31.2 | % |  | 31.5 | %
Risk-free interest rate | 0.9 | % |  | 2.2 | % |  | 2.7 | %
Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following tables set forth assets and liabilities measured at fair value on a recurring basis:
| December 31, 2020
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 98.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 98.0 |
Total assets measured and recorded at fair value | $ | 98.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 98.0 |
Liabilities: |  |  |  |  |  |  |
Derivative liabilities | $ | — |  |  | $ | 216.4 |  |  | $ | — |  |  | $ | 216.4 |
Total liabilities measured and recorded at fair value | $ | — |  |  | $ | 216.4 |  |  | $ | — |  |  | $ | 216.4 |
| December 31, 2019
Assets: | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and cash equivalents: |  |  |  |  |  |  |
Reverse repurchase agreements(1) | $ | — |  |  | $ | 70.0 |  |  | $ | — |  |  | $ | 70.0 |
Commercial paper | — |  |  | 102.0 |  |  | — |  |  | 102.0 |
Money market funds | 444.0 |  |  | — |  |  | — |  |  | 444.0 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper and other | 0.7 |  |  | 22.9 |  |  | — |  |  | 23.6 |
Total assets measured and recorded at fair value | $ | 444.7 |  |  | $ | 194.9 |  |  | $ | — |  |  | $ | 639.6 |
Liabilities: |  |  |  |  |  |  |
Derivative liabilities | $ | — |  |  | $ | 93.8 |  |  | $ | — |  |  | $ | 93.8 |
Total liabilities measured and recorded at fair value | $ | — |  |  | $ | 93.8 |  |  | $ | — |  |  | $ | 93.8 |
_________________________________ (1) Reverse repurchase agreements include a $70.0 million repurchase agreement with Morgan Stanley, callable with 31 days notice.

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