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Fair Value Measurements (Estimated Fair Values of Long-Term Debt) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
$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	$ 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	$ 749.1
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	$ 589.3
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	$ 659.1
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	493.7
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	$ 749.7

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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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