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Debt (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Debt Table
Debt at each of the balance sheet periods consisted of:
 September 30, 2023September 30, 2022December 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