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v3.23.3

Debt (Tables) | 9 Months Ended
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Sep. 30, 2023
Debt Disclosure [Abstract] |
Debt Table | Debt at each of the balance sheet periods consisted of:
| September 30, 2023 |  | September 30, 2022 |  | December 31, 2022
(millions) | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
2.45% Senior Notes due 2027 (issued: $500.0, August 2016) | $ | 498.5 |  |  | $ | 455.8 |  |  | $ | 498.1 |  |  | $ | 459.7 |  |  | $ | 498.2 |  |  | $ | 457.7 |
2.50% Senior Notes due 2027 (issued: $500.0, March 2022) | 497.9 |  |  | 454.0 |  |  | 497.4 |  |  | 451.6 |  |  | 497.5 |  |  | 460.3 |
6 5/8% Senior Notes due 2029 (issued: $300.0, March 1999) | 297.7 |  |  | 320.8 |  |  | 297.4 |  |  | 322.1 |  |  | 297.5 |  |  | 326.8 |
4.00% Senior Notes due 2029 (issued: $550.0, October 2018) | 546.8 |  |  | 518.9 |  |  | 546.3 |  |  | 519.5 |  |  | 546.4 |  |  | 527.8 |
3.20% Senior Notes due 2030 (issued: $500.0, March 2020) | 497.2 |  |  | 435.1 |  |  | 496.8 |  |  | 439.3 |  |  | 496.9 |  |  | 448.6 |
3.00% Senior Notes due 2032 (issued: $500.0, March 2022) | 496.2 |  |  | 420.5 |  |  | 495.8 |  |  | 418.8 |  |  | 495.9 |  |  | 438.1 |
6.25% Senior Notes due 2032 (issued: $400.0, November 2002) | 396.6 |  |  | 414.3 |  |  | 396.4 |  |  | 426.0 |  |  | 396.4 |  |  | 435.4 |
4.95% Senior Notes due 2033 (issued: $500.0, May 2023) | 496.4 |  |  | 474.7 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |
4.35% Senior Notes due 2044 (issued: $350.0, April 2014) | 347.0 |  |  | 280.9 |  |  | 346.9 |  |  | 298.5 |  |  | 346.9 |  |  | 298.4 |
3.70% Senior Notes due 2045 (issued: $400.0, January 2015) | 395.8 |  |  | 288.2 |  |  | 395.7 |  |  | 305.7 |  |  | 395.7 |  |  | 310.2 |
4.125% Senior Notes due 2047 (issued: $850.0, April 2017) | 842.2 |  |  | 666.3 |  |  | 842.0 |  |  | 710.3 |  |  | 842.1 |  |  | 716.2 |
4.20% Senior Notes due 2048 (issued: $600.0, March 2018) | 590.6 |  |  | 473.3 |  |  | 590.3 |  |  | 505.9 |  |  | 590.4 |  |  | 507.0 |
3.95% Senior Notes due 2050 (issued: $500.0, March 2020) | 491.1 |  |  | 373.5 |  |  | 490.9 |  |  | 396.6 |  |  | 490.9 |  |  | 404.9 |
3.70% Senior Notes due 2052 (issued: $500.0, March 2022) | 493.6 |  |  | 355.8 |  |  | 493.4 |  |  | 380.7 |  |  | 493.5 |  |  | 386.5 |
Total | $ | 6,887.6 |  |  | $ | 5,932.1 |  |  | $ | 6,387.4 |  |  | $ | 5,634.7 |  |  | $ | 6,388.3 |  |  | $ | 5,717.9 |

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