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Debt and Letters of Credit - Narrative (Details)
$ in Thousands, € in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
EUR (€)
Financing Arrangements      
Repayments of debt $ 525,212 $ 0  
Senior Notes 1.750%, Due 2023 and Senior Notes 3.50%, Due 2024      
Financing Arrangements      
Repayments of debt 26,000    
Senior Notes 1.750%, Due 2023 and Senior Notes 3.50%, Due 2024 | General and Administrative Expense      
Financing Arrangements      
Loss on debt redemptions 20,000    
Senior Notes 1.750 Percent, Due 2023      
Financing Arrangements      
Debt instrument, face amount 375,000    
Senior Notes 3.50 Percent, Due 2024      
Financing Arrangements      
Debt instrument, face amount 108,000    
Lines of credit      
Financing Arrangements      
Amount outstanding under credit facilities 399,000    
Lines of credit | Committed Line of Credit      
Financing Arrangements      
Current borrowing capacity 795,000    
Lines of credit | Committed Line of Credit | Revolving Loan And Letter Of Credit Facility Agreement | Subsidiaries      
Financing Arrangements      
Covenant minimum liquidity 1,250,000    
Lines of credit | Committed Line of Credit | Revolving Loan and Letter Of Credit Facility Agreement 1.7 Billion      
Financing Arrangements      
Maximum borrowing capacity $ 1,650,000    
Lines of credit | Committed Line of Credit | Revolving Loan and Letter Of Credit Facility Agreement 1.7 Billion | Minimum      
Financing Arrangements      
Ratio of consolidated debt to tangible net worth (as a percent) 65.00%    
Lines of credit | Committed Line of Credit | Revolving Loan and Letter Of Credit Facility Agreement 1.7 Billion | Minimum | Subsidiaries      
Financing Arrangements      
Aggregate amount of debt | €     € 750
Lines of credit | Committed Line of Credit | Revolving Loan and Letter Of Credit Facility Agreement 1.7 Billion | Maximum      
Financing Arrangements      
Ratio of consolidated debt to tangible net worth (as a percent) 100.00%    
Lines of credit | Committed Line of Credit | Revolving Loan and Letter Of Credit Facility Agreement 1.7 Billion | Maximum | Subsidiaries      
Financing Arrangements      
Aggregate amount of debt $ 750,000    
Lines of credit | Uncommitted Line of Credit      
Financing Arrangements      
Amount outstanding under credit facilities $ 900,000