v3.26.1
Debt (Schedule Of Short-Term And Long-Term Debt) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2013
Mar. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]      
Long-term debt   $ 3,423.2 $ 3,422.3
Forward starting interest rate swap agreement fixed rate 4.73%    
$750.0 Million Fixed Rate Notes Due March 2025, stated rate of 3.00% [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount   $ 750.0  
Debt Instrument, Maturity Date   Mar. 15, 2025  
Debt Instrument, Interest Rate, Stated Percentage   3.00%  
$500.0 Million Fixed Rate Notes Due June 2028, stated rate of 3.75% [Member] [Domain]      
Debt Instrument [Line Items]      
Long-term debt   $ 499.1 498.9
Debt Instrument, Face Amount   $ 750.0  
Debt Instrument, Maturity Date   Mar. 15, 2030  
Debt Instrument, Interest Rate, Stated Percentage   4.40%  
$750.0 million Fixed Rate Notes Due September 2043, stated rate of 5.30% [Member]      
Debt Instrument [Line Items]      
Long-term debt   $ 744.7 744.6
Debt Instrument, Face Amount   $ 750.0  
Debt Instrument, Maturity Date   Sep. 15, 2043  
Debt Instrument, Interest Rate, Stated Percentage   5.30%  
$700.0 Million Fixed Rate Notes Due June 2048, stated rate of 4.15% [Member] [Domain] [Domain]      
Debt Instrument [Line Items]      
Long-term debt   $ 692.0 692.1
Debt Instrument, Face Amount   $ 700.0  
Debt Instrument, Maturity Date   Jun. 15, 2048  
Debt Instrument, Interest Rate, Stated Percentage   4.15%  
$750.0 Million Fixed Rate Notes Due March 2032, Interest Equal To 2.65%      
Debt Instrument [Line Items]      
Long-term debt   $ 744.8 744.6
Debt Instrument, Face Amount   $ 750.0  
Debt Instrument, Maturity Date   Mar. 15, 2032  
Debt Instrument, Interest Rate, Stated Percentage   2.65%  
$750.0 Million Fixed Rate Notes Due March 2030, Interest Equal To 4.4% [Abstract]      
Debt Instrument [Line Items]      
Long-term debt   $ 742.6 $ 742.1
$500.0 Million Fixed Rate Notes Due June 2028, Interest Equal To 3.75% [Domain]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount   $ 500.0  
Debt Instrument, Maturity Date   Jun. 15, 2028  
Debt Instrument, Interest Rate, Stated Percentage   3.75%