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Debt (Tables)
9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Debt Table Debt at each of the balance sheet periods consisted of:
 September 30, 2020September 30, 2019December 31, 2019
(millions)Carrying
Value
Fair
Value
Carrying
Value
Fair
Value
Carrying
Value
Fair
Value
3.75% Senior Notes due 2021$499.7 $515.3 $499.3 $516.5 $499.4 $515.6 
2.45% Senior Notes due 2027497.2 532.0 496.8 502.1 496.9 501.5 
6 5/8% Senior Notes due 2029296.8 411.4 296.5 392.2 296.6 392.5 
4.00% Senior Notes due 2029545.3 662.5 544.9 617.0 545.0 614.3 
3.20% Senior Notes due 2030496.0 572.4 
6.25% Senior Notes due 2032395.9 587.2 395.7 547.2 395.7 552.6 
4.35% Senior Notes due 2044
346.7 450.5 346.6 414.7 346.7 417.0 
3.70% Senior Notes due 2045
395.5 473.5 395.4 431.8 395.4 434.2 
4.125% Senior Notes due 2047
841.7 1,078.5 841.5 987.4 841.6 986.1 
4.20% Senior Notes due 2048
590.0 775.3 589.8 704.4 589.8 705.8 
3.95% Senior Notes due 2050
490.6 628.8 
Total$5,395.4 $6,687.4 $4,406.5 $5,113.3 $4,407.1 $5,119.6