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Fair Value Measurements (Estimated Fair Values of Long-Term Debt) (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($)
$750.0 million Fixed Rate Notes Due September 2043, stated rate of 5.30% [Member] |
Debt Instrument, Face Amount | $ 750.0
Debt Instrument, Maturity Date | Sep. 15, 2043
$700.0 Million Fixed Rate Notes Due June 2048, stated rate of 4.15% [Member] [Domain] [Domain] |
Debt Instrument, Face Amount | $ 700.0
Debt Instrument, Maturity Date | Jun. 15, 2048
$750.0 Million Fixed Rate Notes Due March 2032, Interest Equal To 2.65% |
Debt Instrument, Face Amount | $ 750.0
Debt Instrument, Maturity Date | Mar. 15, 2032
$500.0 Million Fixed Rate Notes Due June 2028, stated rate of 3.75% [Member] [Domain] |
Debt Instrument, Face Amount | $ 750.0
Debt Instrument, Maturity Date | Mar. 15, 2030
$750.0 Million Fixed Rate Notes Due March 2025, stated rate of 3.00% [Member] |
Debt Instrument, Face Amount | $ 750.0
Debt Instrument, Maturity Date | Mar. 15, 2025
Fair Value, Inputs, Level 2 [Member] | $750.0 million Fixed Rate Notes Due September 2043, stated rate of 5.30% [Member] |
Debt Instrument, Fair Value Disclosure | $ 767.6
Debt Instrument, Face Amount | $ 750.0
Debt Instrument, Maturity Date | Sep. 15, 2043
Fair Value, Inputs, Level 2 [Member] | $700.0 Million Fixed Rate Notes Due June 2048, stated rate of 4.15% [Member] [Domain] [Domain] |
Debt Instrument, Fair Value Disclosure | $ 596.9
Debt Instrument, Face Amount | $ 700.0
Debt Instrument, Maturity Date | Jun. 15, 2048
Fair Value, Inputs, Level 2 [Member] | $750.0 Million Fixed Rate Notes Due March 2032, Interest Equal To 2.65% |
Debt Instrument, Fair Value Disclosure | $ 682.1
Fair Value, Inputs, Level 2 [Member] | $500.0 Million Fixed Rate Notes Due June 2028, stated rate of 3.75% [Member] [Domain] |
Debt Instrument, Fair Value Disclosure | 498.9
Debt Instrument, Face Amount | $ 500.0
Debt Instrument, Maturity Date | Jun. 15, 2028
Fair Value, Inputs, Level 2 [Member] | $750.0 Million Fixed Rate Notes Due March 2025, stated rate of 3.00% [Member] |
Debt Instrument, Face Amount | $ 750.0
Debt Instrument, Maturity Date | Mar. 15, 2025
Fair Value, Inputs, Level 2 [Member] | $750.0 Million Fixed Rate Notes Due March 2030, Interest Equal to 4.4% |
Debt Instrument, Fair Value Disclosure | $ 759.3

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