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Debt Obligations - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 01, 2030
Sep. 30, 2020
Sep. 21, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2019
Oct. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 22, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]                          
Proceeds from notes offering               $ 990,130,000 $ 0 $ 990,130,000 $ 0    
Payments under credit facility               1,648,614,000 1,789,924,000 3,602,660,000 4,038,762,000    
Amount borrowed under the credit facility   $ 195,350,000           195,350,000   195,350,000     $ 1,346,290,000
Borrowings under credit facility               478,762,000 $ 2,118,501,000 2,453,941,000 $ 4,834,014,000    
Term Loan                          
Line of Credit Facility [Line Items]                          
Payments under credit facility               1,210,000,000          
Letters of Credit                          
Line of Credit Facility [Line Items]                          
Letters of credit and bank guarantees   91,900,000           91,900,000   91,900,000      
2.900% Senior Notes due 2030 | Senior Notes                          
Line of Credit Facility [Line Items]                          
Debt instrument   $ 1,000,000,000.00           $ 1,000,000,000.00   $ 1,000,000,000.00      
Interest rate   2.90%           2.90%   2.90%      
Proceeds from notes offering               $ 986,700,000          
2.900% Senior Notes due 2030 | Senior Notes | Debt Instrument, Redemption, Period One                          
Line of Credit Facility [Line Items]                          
Redemption price, percentage               100.00%          
2.900% Senior Notes due 2030 | Senior Notes | Debt Instrument, Redemption, Period Two | Forecast                          
Line of Credit Facility [Line Items]                          
Redemption price, percentage 100.00%                        
2.900% Senior Notes due 2030 | Maximum | Senior Notes | Debt Instrument, Redemption, Period One                          
Line of Credit Facility [Line Items]                          
Redemption price, percentage               101.00%          
Senior Credit Facility                          
Line of Credit Facility [Line Items]                          
Option to increase revolving commitments under the credit agreement   $ 400,000,000.0           $ 400,000,000.0   $ 400,000,000.0      
Credit facility available for revolving loans or issuing new letters of credit   $ 1,950,000,000           $ 1,950,000,000   1,950,000,000      
Reduction in Quanta's funded indebtedness reduced by cash and cash equivalents in excess of this amount                   $ 25,000,000.0      
Maximum consolidated leverage ratio   3.5           3.5   3.5      
Acquisition threshold for leverage ratio                   $ 200,000,000.0      
Maximum consolidated leverage ratio permissible under credit agreement                   4.0      
Minimum consolidated interest coverage ratio                   3.0      
Amount of availability under the credit agreement and/or cash and cash equivalents on hand that must be present to allow for cash payments of dividends and stock repurchases   $ 100,000,000.0           $ 100,000,000.0   $ 100,000,000.0      
Cross default provisions with debt instruments exceeding this amount   $ 150,000,000.0           150,000,000.0   $ 150,000,000.0      
Senior Credit Facility | Minimum                          
Line of Credit Facility [Line Items]                          
Commitment fee   0.275% 0.20%                    
Senior Credit Facility | Maximum                          
Line of Credit Facility [Line Items]                          
Commitment fee   0.425% 0.40%                    
Senior Credit Facility | Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only | Minimum                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   1.125%      
Senior Credit Facility | Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only | Maximum                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   2.00%      
Senior Credit Facility | Excess of Base Rate Domestic Borrowings Only | Minimum                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   0.125%      
Senior Credit Facility | Excess of Base Rate Domestic Borrowings Only | Maximum                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   1.00%      
Senior Credit Facility | Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings | Minimum                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   1.125%      
Senior Credit Facility | Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings | Maximum                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   2.00%      
Senior Credit Facility | Excess of Federal Funds Rate                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   0.50%      
Senior Credit Facility | Excess of Euro Currency Rate                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   1.00%      
Senior Credit Facility | Canadian Dollars                          
Line of Credit Facility [Line Items]                          
Amount borrowed under the credit facility   $ 151,700,000           151,700,000   $ 151,700,000      
Senior Credit Facility | Australian Dollars                          
Line of Credit Facility [Line Items]                          
Amount borrowed under the credit facility   43,700,000           43,700,000   $ 43,700,000      
Senior Credit Facility | Revolving Credit Facility                          
Line of Credit Facility [Line Items]                          
Borrowing capacity     $ 2,140,000,000                 $ 2,510,000,000  
Senior Credit Facility | Term Loan                          
Line of Credit Facility [Line Items]                          
Borrowings under credit facility           $ 675,000,000.0 $ 600,000,000.0            
Quarterly amortization payment       $ 16,100,000 $ 7,500,000                
Senior Credit Facility | Term Loan | Eurocurrency Rate | Minimum                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   1.125%      
Senior Credit Facility | Term Loan | Eurocurrency Rate | Maximum                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   1.875%      
Senior Credit Facility | Revolving Loans and Letters of Credit in Alternative Currencies | U.S. Dollar                          
Line of Credit Facility [Line Items]                          
Borrowing capacity   800,000,000.0           800,000,000.0   $ 800,000,000.0      
Senior Credit Facility | Swing Lines Loan | U.S. Dollar                          
Line of Credit Facility [Line Items]                          
Borrowing capacity   100,000,000.0           100,000,000.0   100,000,000.0      
Senior Credit Facility | Swing Lines Loan | Canadian Dollars                          
Line of Credit Facility [Line Items]                          
Borrowing capacity   50,000,000.0           50,000,000.0   50,000,000.0      
Senior Credit Facility | Swing Lines Loan | Australian Dollars                          
Line of Credit Facility [Line Items]                          
Borrowing capacity   50,000,000.0           50,000,000.0   50,000,000.0      
Senior Credit Facility | Letters of Credit and Bank Guarantees | U.S. Dollar                          
Line of Credit Facility [Line Items]                          
Letters of credit and bank guarantees   265,100,000           265,100,000   265,100,000      
Senior Credit Facility | Letters of Credit and Bank Guarantees | Canadian Dollars                          
Line of Credit Facility [Line Items]                          
Letters of credit and bank guarantees   99,400,000           99,400,000   99,400,000      
Senior Credit Facility | Letters of Credit                          
Line of Credit Facility [Line Items]                          
Borrowing capacity   900,000,000.0           900,000,000.0   900,000,000.0      
Letters of credit and bank guarantees   364,500,000           364,500,000   364,500,000      
Senior Credit Facility | Letters of Credit | Senior Credit Facility Lender                          
Line of Credit Facility [Line Items]                          
Letters of credit and bank guarantees   $ 93,000,000.0           $ 93,000,000.0   $ 93,000,000.0      
Senior Credit Facility | Standby Letters of Credit | Minimum                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   1.125%      
Senior Credit Facility | Standby Letters of Credit | Maximum                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   2.00%      
Senior Credit Facility | Performance Letters of Credit | Minimum                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   0.675%      
Senior Credit Facility | Performance Letters of Credit | Maximum                          
Line of Credit Facility [Line Items]                          
Debt instrument basis spread on variable rate                   1.15%