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Fair Value Measurements (Debt Instruments) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Long-term debt |  | $ 2,678.2 | $ 3,425.4
$750.0 Million Fixed Rate Notes Due March 2025, Interest Equal To 3.00% [Member] |  |  |
Long-term debt | [1] | 0.0 | 749.1
$500.0 Million Fixed Rate Notes Due June 2028, Interest Equal To 3.75% [Member] [Domain] |  |  |
Long-term debt |  | 498.5 | 498.1
$750.0 million Fixed Rate Notes Due September 2043 Interest Equal To 5.3% [Member] |  |  |
Long-term debt | [2] | 744.3 | 744.0
$700.0 Million Fixed Rate Notes Due June 2048, Interest Equal To 4.15% [Member] [Domain] [Domain] |  |  |
Long-term debt |  | 691.7 | 691.3
$750.0 Million Fixed Rate Notes Due March 2032, Interest Equal To 2.65% |  |  |
Long-term debt |  | 743.7 | $ 742.9
Fair Value, Inputs, level 2 [Member] | $750.0 Million Fixed Rate Notes Due March 2025, Interest Equal To 3.00% [Member] |  |  |
Debt Instrument, Fair Value Disclosure |  | 747.0 |
Fair Value, Inputs, level 2 [Member] | $500.0 Million Fixed Rate Notes Due June 2028, Interest Equal To 3.75% [Member] [Domain] |  |  |
Debt Instrument, Fair Value Disclosure |  | 487.1 |
Fair Value, Inputs, level 2 [Member] | $750.0 million Fixed Rate Notes Due September 2043 Interest Equal To 5.3% [Member] |  |  |
Debt Instrument, Fair Value Disclosure |  | 752.4 |
Fair Value, Inputs, level 2 [Member] | $700.0 Million Fixed Rate Notes Due June 2048, Interest Equal To 4.15% [Member] [Domain] [Domain] |  |  |
Debt Instrument, Fair Value Disclosure |  | 581.1 |
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 |  | $ 646.4 |
[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%.
[2] | 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%

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