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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | Income before income taxes and loss from equity method investment consisted of the following (in millions):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Domestic | $ | 567.7 |  |  | $ | 490.6 |  |  | $ | 371.7 |
Foreign | 60.7 |  |  | 51.1 |  |  | 14.3 |
Total income before income taxes and loss from equity method investment | $ | 628.4 |  |  | $ | 541.7 |  |  | $ | 386.0 |
Schedule of Components of Income Tax Expense (Benefit) | The provision for (benefit from) income taxes consisted of the following (in millions):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Current: |  |  |  |  |
Federal | $ | 80.7 |  |  | $ | 38.6 |  |  | $ | 11.0 |
State | 2.5 |  |  | 8.1 |  |  | 0.1 |
Foreign | 23.3 |  |  | 13.6 |  |  | 11.4 |
Total current | $ | 106.5 |  |  | $ | 60.3 |  |  | $ | 22.5 |
Deferred: |  |  |  |  |
Federal | $ | (90.2) |  |  | $ | (8.1) |  |  | $ | 40.6 |
State | (1.1) |  |  | (0.8) |  |  | (6.0) |
Foreign | (1.1) |  |  | 1.8 |  |  | (2.8) |
Total deferred | (92.4) |  |  | (7.1) |  |  | 31.8 |
Provision for income taxes | $ | 14.1 |  |  | $ | 53.2 |  |  | $ | 54.3 |
Schedule of Effective Income Tax Rate Reconciliation | The provision for income taxes differs from the amount computed by applying the statutory federal income tax rate as follows (in millions):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Tax at federal statutory tax rate | $ | 132.0 |  |  | $ | 113.8 |  |  | $ | 81.2 |
Foreign income taxed at different rates | 2.9 |  |  | 16.4 |  |  | 12.3 |
Foreign withholding taxes | 37.4 |  |  | 18.8 |  |  | 16.0 |
Stock-based compensation expense | (74.8) |  |  | (39.6) |  |  | (30.6) |
Foreign tax credit | (53.2) |  |  | (30.1) |  |  | (30.4) |
State taxes—net of federal benefit | (4.6) |  |  | 4.9 |  |  | (11.3) |
Research and development credit | (11.1) |  |  | (7.5) |  |  | (6.8) |
Valuation allowance | 20.0 |  |  | 11.9 |  |  | 22.0 |
Impact of the 2017 Tax Act: |  |  |  |  |
One-time transition tax | 5.8 |  |  | 2.6 |  |  | (2.1) |
Foreign-Derived Intangible Income | (33.6) |  |  | (44.3) |  |  | — |
Other | (6.7) |  |  | 6.3 |  |  | 4.0 |
Total provision for income taxes | $ | 14.1 |  |  | $ | 53.2 |  |  | $ | 54.3 |
Schedule of Deferred Tax Assets and Liabilities | The tax effects of temporary differences that give rise to significant portions of the deferred tax assets as of the years ended are presented below (in millions):
| December 31, 2021 |  | December 31, 2020
Deferred tax assets: |  |  |
General business credit carryforward | $ | 63.5 |  |  | $ | 48.9 |
Deferred revenue | 276.5 |  |  | 216.4 |
Reserves and accruals | 59.5 |  |  | 41.9 |
Net operating loss carryforward | 22.2 |  |  | 23.4 |
Stock-based compensation expense | 18.3 |  |  | 17.5 |
Depreciation and amortization | 17.0 |  |  | 6.3 |
Capitalized research expenditures | 64.2 |  |  | 16.6 |
Operating lease liabilities | 13.1 |  |  | 11.6 |
Total deferred tax assets | 534.3 |  |  | 382.6 |
Less: Valuation allowance | (75.0) |  |  | (54.9) |
Deferred tax assets, net of valuation allowance | 459.3 |  |  | 327.7 |
Deferred tax liabilities: |  |  |
Deferred contract costs | (97.4) |  |  | (74.0) |
Operating lease ROU assets | (11.9) |  |  | (10.8) |
Acquired intangibles | (15.7) |  |  | (5.7) |
Total deferred tax liabilities | (125.0) |  |  | (90.5) |
Net deferred tax assets | $ | 334.3 |  |  | $ | 237.2 |
Schedule of Aggregate Changes in Unrecognized Tax Benefits | The aggregate changes in the balance of unrecognized tax benefits are as follows (in millions):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Unrecognized tax benefits, beginning of year | $ | 77.3 |  |  | $ | 67.5 |  |  | $ | 63.5 |
Gross increases for tax positions related to the current year | 7.6 |  |  | 13.1 |  |  | 11.4 |
Gross decreases for tax positions related to the current year | — |  |  | — |  |  | — |
Gross increases for tax positions related to the prior year | 8.7 |  |  | 6.1 |  |  | 3.0 |
Gross decreases for tax positions related to prior year | (0.7) |  |  | (1.3) |  |  | (0.3) |
Gross decreases for tax positions related to prior year audit settlements | — |  |  | (1.4) |  |  | (1.7) |
Gross decreases for tax positions related to expiration of statute of limitations | (19.6) |  |  | (6.7) |  |  | (8.4) |
Unrecognized tax benefits, end of year | $ | 73.3 |  |  | $ | 77.3 |  |  | $ | 67.5 |

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