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Fair Value Measurements (Debt Instruments) (Details) - USD ($)
$ in Millions

Dec. 31, 2023

Dec. 31, 2022

Long-term debt

$ 3,425.4

$ 3,422.4

$750.0 Million Fixed Rate Notes Due March 2025, Interest Equal To 3.00% [Member]

Long-term debt

^[1]

749.1

748.4

$500.0 Million Fixed Rate Notes Due June 2028, Interest Equal To 3.75% [Member] [Domain]

Long-term debt

498.1

497.7

$750.0 million Fixed Rate Notes Due September 2043 Interest Equal To 5.3% [Member]

Long-term debt

^[2]

744.0

743.7

$700.0 Million Fixed Rate Notes Due June 2048, Interest Equal To 4.15% [Member] [Domain] [Domain]

Long-term debt

691.3

690.9

$750.0 Million Fixed Rate Notes Due March 2032, Interest Equal To 2.65%

Long-term debt

742.9

$ 741.7

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

733.8

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

489.3

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

802.2

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

641.0

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

$ 669.0

[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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1D

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-10

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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