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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2026
Fair Value Disclosures [Abstract] |
Carrying Values and Fair Values of Debt Instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Carrying Value at | ​ | Fair Value (a) at
​ | ​ | June 30, | ​ | December 31, | ​ | June 30, | ​ | December 31,
​ | ​ ​ ​ | 2026 | ​ ​ ​ | 2025 | ​ ​ ​ | 2026 | ​ ​ ​ | 2025
4.25% Senior Notes due 2028 | ​ | $ | 500,000 | ​ | $ | 500,000 | ​ | $ | 496,950 | ​ | $ | 503,750
3.50% Senior Notes due 2029 | ​ | $ | 500,000 | ​ | $ | 500,000 | ​ | $ | 487,200 | ​ | $ | 491,900
4.50% Senior Notes due 2029 | ​ | $ | 351,850 | ​ | $ | 364,800 | ​ | $ | 361,561 | ​ | $ | 377,001
2.60% Senior Notes due 2030 | ​ | $ | 600,000 | ​ | $ | 600,000 | ​ | $ | 561,840 | ​ | $ | 566,100
2.20% Senior Notes due 2032 | ​ | $ | 650,000 | ​ | $ | 650,000 | ​ | $ | 569,595 | ​ | $ | 574,730
3.20% Senior Notes due 2032 | ​ | $ | 500,000 | ​ | $ | 500,000 | ​ | $ | 459,500 | ​ | $ | 465,900
4.20% Senior Notes due 2033 | ​ | $ | 750,000 | ​ | $ | 750,000 | ​ | $ | 721,275 | ​ | $ | 736,350
5.00% Senior Notes due 2034 | ​ | $ | 750,000 | ​ | $ | 750,000 | ​ | $ | 731,625 | ​ | $ | 767,175
5.25% Senior Notes due 2035 | ​ | $ | 500,000 | ​ | $ | 500,000 | ​ | $ | 500,100 | ​ | $ | 518,550
4.80% Senior Notes due 2036 | ​ | $ | 600,000 | ​ | $ | — | ​ | $ | 585,300 | ​ | $ | —
3.05% Senior Notes due 2050 | ​ | $ | 500,000 | ​ | $ | 500,000 | ​ | $ | 333,150 | ​ | $ | 335,550
2.95% Senior Notes due 2052 | ​ | $ | 850,000 | ​ | $ | 850,000 | ​ | $ | 546,720 | ​ | $ | 551,650
| (a) | Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value inputs include third-party calculations of the market interest rate of notes with similar ratings in similar industries over the remaining note terms.

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