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Stockholders' Equity - Schedule of Share Based Compensation Restricted Stock Units Award Activity (Detail) - Restricted Stock Units (RSUs) [Member]
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested Outstanding Shares, Beginning balance | shares 62.4
Unvested Shares, Granted | shares 17.6
Unvested Shares, Vested | shares (5.8)
Unvested Shares, Forfeited | shares (1.5)
Unvested Outstanding Shares, Ending balance | shares 72.7
Unvested Weighted Average Grant Date Fair Value, Beginning balance | $ / shares $ 8.68
Unvested Weighted Average Grant Date Fair Value, Granted | $ / shares 8.86
Unvested Weighted Average Grant Date Fair Value, Vested | $ / shares 8.30
Unvested Weighted Average Grant Date Fair Value, Forfeited | $ / shares 8.50
Unvested Weighted Average Grant Date Fair Value, Ending balance | $ / shares $ 8.76
Unvested, Aggregate Intrinsic Value of Unvested RSU | $ $ 399.4
Unvested, Aggregate Intrinsic Value of Unvested RSU | $ $ 671.7