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Stock-Based Compensation - RSUs to be Settled in Cash (Details) - Restricted Stock Units to be Settled in Cash - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for RSUs to be settled in cash			3 years
Amount in cash received for each RSU is equal to the fair value of this number of Quanta common stock shares (in shares)			1
Compensation expense related to RSUs to be settled in cash	$ 1.6	$ 1.1	$ 2.7	$ 3.7
Payments to settle liabilities under compensation plan	0.2	$ 2.1	3.5	$ 5.0
Accrued liabilities under compensation plan	$ 2.4		$ 2.4		$ 4.3

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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

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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