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Fair value measurements - Assets and Liabilities on Recurring Basis (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Transfers In Fair Value Hierarchy $ 0  
Net assets classified as held for sale 371,257,000 $ 191,433,000
Investments 1,476,985,000 1,449,518,000
Secured notes payable 149,909,000 119,662,000
Unsecured senior notes payable 12,094,465,000 11,096,028,000
Unsecured senior line of credit and commercial paper 0 99,952,000
Book Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Secured notes payable 149,909,000 119,662,000
Unsecured senior notes payable 12,094,465,000 11,096,028,000
Book Value | Commercial paper program    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial paper program 0 99,952,000
Book Value | Unsecured senior line of credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unsecured senior line of credit and commercial paper 0 0
Fair Value | Fair value measured on nonrecurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Real Estate, Held-for-Sale 322,662,000 133,885,000
Secured notes payable, fair value 149,413,000 118,660,000
Unsecured senior notes payable, fair value 10,472,993,000 9,708,930,000
Fair Value | Fair value measured on nonrecurring basis | Commercial paper program    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial paper program, fair value 0 99,915,000
Fair Value | Fair value measured on nonrecurring basis | Unsecured senior line of credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unsecured senior line of credit, fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Fair value measured on nonrecurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-Lived Asset, Held-for-Sale, Fair Value Disclosure 0 0
Secured notes payable, fair value 0 0
Unsecured senior notes payable, fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Fair value measured on nonrecurring basis | Commercial paper program    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial paper program, fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Fair value measured on nonrecurring basis | Unsecured senior line of credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unsecured senior line of credit, fair value 0 0
Significant Other Observable Inputs (Level 2) | Fair Value | Fair value measured on nonrecurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-Lived Asset, Held-for-Sale, Fair Value Disclosure 0 0
Secured notes payable, fair value 149,413,000 118,660,000
Unsecured senior notes payable, fair value 10,472,993,000 9,708,930,000
Significant Other Observable Inputs (Level 2) | Fair Value | Fair value measured on nonrecurring basis | Commercial paper program    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial paper program, fair value 0 99,915,000
Significant Other Observable Inputs (Level 2) | Fair Value | Fair value measured on nonrecurring basis | Unsecured senior line of credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unsecured senior line of credit, fair value 0 0
Significant Unobservable Inputs (Level 3) | Fair Value | Fair value measured on nonrecurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-Lived Asset, Held-for-Sale, Fair Value Disclosure 322,662,000 133,885,000
Secured notes payable, fair value 0 0
Unsecured senior notes payable, fair value 0 0
Significant Unobservable Inputs (Level 3) | Fair Value | Fair value measured on nonrecurring basis | Commercial paper program    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial paper program, fair value 0 0
Significant Unobservable Inputs (Level 3) | Fair Value | Fair value measured on nonrecurring basis | Unsecured senior line of credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unsecured senior line of credit, fair value 0 0
Investments in publicly traded companies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in publicly traded companies 105,667,000 159,566,000
Investments in publicly traded companies | Fair value measured on recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in publicly traded companies 105,667,000 159,566,000
Investments in publicly traded companies | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value | Fair value measured on recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in publicly traded companies 105,667,000 159,566,000
Investments in publicly traded companies | Significant Other Observable Inputs (Level 2) | Fair Value | Fair value measured on recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in publicly traded companies 0 0
Investments in publicly traded companies | Significant Unobservable Inputs (Level 3) | Fair Value | Fair value measured on recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in publicly traded companies 0 0
Investments in privately held entities that report NAV    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in publicly traded companies 609,866,000 671,532,000
Investments in privately held entities that do not report NAV | Entities without observable price changes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in privately held entities that do not report fair value, book value 400,487,000 368,654,000
Investments in privately held entities that do not report NAV | Entities without observable price changes | Fair Value | Fair value measured on nonrecurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in privately held entities that do not report fair value, book value 184,236,000 188,689,000
Investments in privately held entities that do not report NAV | Quoted Prices in Active Markets for Identical Assets (Level 1) | Entities without observable price changes | Fair Value | Fair value measured on nonrecurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in privately held entities that do not report fair value, book value 0 0
Investments in privately held entities that do not report NAV | Significant Other Observable Inputs (Level 2) | Entities without observable price changes | Fair Value | Fair value measured on nonrecurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in privately held entities that do not report fair value, book value 174,737,000 174,268,000
Investments in privately held entities that do not report NAV | Significant Unobservable Inputs (Level 3) | Entities without observable price changes | Fair Value | Fair value measured on nonrecurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in privately held entities that do not report fair value, book value 9,499,000 14,421,000
Investments in privately held entities that do not report NAV | Entities without observable price changes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in privately held entities that do not report fair value, book value $ 400,500,000 $ 368,700,000