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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%

X

- Definition

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

+ References

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X

- Definition

Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

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