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Debt (Tables)
3 Months Ended
Mar. 31, 2025
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt consisted of the following at March 31, 2025 and December 31, 2024: 
(in millions)March 31, 2025December 31, 2024
$500.0 million fixed rate notes due June 2028, stated rate of 3.75%498.6 498.5 
$750.0 million fixed rate notes due March 2030, stated rate of 4.4%
740.7 — 
$750.0 million fixed rate notes due March 2032, stated rate of 2.65%
744.0 743.7 
$750.0 million fixed rate notes due September 2043, stated rate of 5.30% (1)
744.4 744.3 
$700.0 million fixed rate notes due June 2048, stated rate of 4.15%691.7 691.7 
Total long-term debt$3,419.4 $2,678.2 
(1)The company maintained a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 4.73%.
Schedule of Short-term Debt
Short-term debt consisted of the following at March 31, 2025 and December 31, 2024:
(in millions)March 31, 2025December 31, 2024
$750.0 million fixed rate notes due March 2025, stated rate of 3.00% (1)
$— $749.8 
Total short-term debt$— $749.8 
(1)The company maintained a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 3.11%.
Schedule of Maturities of Long-term Debt [Table Text Block]
Long-term debt maturities, at par value, were as follows at March 31, 2025:  
(in millions)Par Value
2026$— 
2027— 
2028500.0 
2029— 
2030750.0 
Thereafter2,200.0