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Debt (Tables) | 6 Months Ended
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Jun. 30, 2024
Debt Disclosure [Abstract] |
Debt Table | Debt at each of the balance sheet periods consisted of:
| June 30, 2024 |  | June 30, 2023 |  | December 31, 2023
(millions) | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
2.45% Senior Notes due 2027 (issued: $500.0, August 2016) | $ | 498.8 |  |  | $ | 468.8 |  |  | $ | 498.4 |  |  | $ | 459.4 |  |  | $ | 498.6 |  |  | $ | 468.9 |
2.50% Senior Notes due 2027 (issued: $500.0, March 2022) | 498.4 |  |  | 468.0 |  |  | 497.8 |  |  | 458.4 |  |  | 498.1 |  |  | 469.1 |
6 5/8% Senior Notes due 2029 (issued: $300.0, March 1999) | 298.0 |  |  | 320.9 |  |  | 297.6 |  |  | 324.2 |  |  | 297.8 |  |  | 328.7 |
4.00% Senior Notes due 2029 (issued: $550.0, October 2018) | 547.2 |  |  | 526.7 |  |  | 546.7 |  |  | 526.4 |  |  | 546.9 |  |  | 542.6 |
3.20% Senior Notes due 2030 (issued: $500.0, March 2020) | 497.5 |  |  | 455.4 |  |  | 497.1 |  |  | 449.2 |  |  | 497.3 |  |  | 462.2 |
3.00% Senior Notes due 2032 (issued: $500.0, March 2022) | 496.5 |  |  | 433.7 |  |  | 496.1 |  |  | 434.5 |  |  | 496.3 |  |  | 446.0 |
6.25% Senior Notes due 2032 (issued: $400.0, November 2002) | 396.8 |  |  | 428.1 |  |  | 396.6 |  |  | 432.0 |  |  | 396.7 |  |  | 445.6 |
4.95% Senior Notes due 2033 (issued: $500.0, May 2023) | 496.6 |  |  | 494.6 |  |  | 496.3 |  |  | 489.9 |  |  | 496.4 |  |  | 513.0 |
4.35% Senior Notes due 2044 (issued: $350.0, April 2014) | 347.0 |  |  | 301.1 |  |  | 346.9 |  |  | 304.0 |  |  | 347.0 |  |  | 314.2 |
3.70% Senior Notes due 2045 (issued: $400.0, January 2015) | 395.9 |  |  | 309.8 |  |  | 395.8 |  |  | 313.6 |  |  | 395.9 |  |  | 325.1 |
4.125% Senior Notes due 2047 (issued: $850.0, April 2017) | 842.4 |  |  | 698.7 |  |  | 842.2 |  |  | 727.0 |  |  | 842.3 |  |  | 756.2 |
4.20% Senior Notes due 2048 (issued: $600.0, March 2018) | 590.7 |  |  | 493.9 |  |  | 590.5 |  |  | 510.3 |  |  | 590.6 |  |  | 534.1 |
3.95% Senior Notes due 2050 (issued: $500.0, March 2020) | 491.2 |  |  | 392.4 |  |  | 491.0 |  |  | 408.4 |  |  | 491.1 |  |  | 422.3 |
3.70% Senior Notes due 2052 (issued: $500.0, March 2022) | 493.7 |  |  | 373.4 |  |  | 493.5 |  |  | 386.7 |  |  | 493.6 |  |  | 403.3 |
Total | $ | 6,890.7 |  |  | $ | 6,165.5 |  |  | $ | 6,886.5 |  |  | $ | 6,224.0 |  |  | $ | 6,888.6 |  |  | $ | 6,431.3 |

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