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Stock-Based Compensation - RSUs to be Settled in Cash (Details) - Restricted Stock Units to be Settled in Cash $ in Millions | 3 Months Ended |
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Mar. 31, 2021 USD ($) unit shares | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of equal annual installments | unit | 3 |  |
Amount in cash received for each RSU is equal to the fair value of this number of Quanta common stock shares (in shares) | shares | 1 |  |
Compensation expense related to RSUs to be settled in cash | $ 4.9 | $ 1.1 |
Payments to settle liabilities under compensation plan | 7.4 | $ 3.3 |
Accrued liabilities under compensation plan | $ 6.2 |  | $ 8.7

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- Definition Amount in cash received for each RSU is equal to the fair value of this number of Quanta common stock shares. + References No definition available. + Details
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