Summary of Significant Accounting Policies - Fair Value Measurements (Details) $ in Thousands, € in Millions	Mar. 31, 2024 EUR (€) item	Mar. 31, 2024 USD ($) item	Dec. 31, 2023 USD ($)
Fair Value Measurements
Number of investments for which fair value is measured on a recurring basis using Level 3 inputs | item	0	0
Recurring
Assets:
Short-term investments		$ 1,300,000	$ 1,000,000
Deferred costs and other assets		127,472	113,779
Total		1,427,472	1,113,779
Other Liabilities
Other Liabilities		31,218	38,146
Level 1 | Recurring
Assets:
Deferred costs and other assets		93,068	97,696
Total		93,068	97,696
Level 2 | Recurring
Assets:
Short-term investments		1,300,000	1,000,000
Deferred costs and other assets		34,404	16,083
Total		1,334,404	1,016,083
Other Liabilities
Other Liabilities		409	9,774
Level 3 | Recurring
Other Liabilities
Other Liabilities		$ 30,809	$ 28,372
Exchangeable Debt | Embedded derivative financial instruments
Fair Value Measurements
Interest rate swap agreements and foreign currency forward contracts, gross liability balance | €	€ 750.0