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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2024

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]

Financial instruments measured at fair value on a recurring basis

						December 31, 2024
(in millions)						Level 1						Level 2						Level 3						Total
Assets at Fair Value:
Marketable securities:
Corporate debt securities						$	8.8					$	—					$	—					$	8.8
Mutual funds						104.2						—						—						104.2
Equity securities						0.2						—						—						0.2
Total Marketable Securities						113.2						—						—						113.2
Total Assets at Fair Value						$	113.2					$	—					$	—					$	113.2

						December 31, 2023
(in millions)						Level 1						Level 2						Level 3						Total
Assets at Fair Value:
Marketable securities:
Corporate debt securities						$	10.2					$	—					$	—					$	10.2
Mutual funds						101.3						—						—						101.3
Equity securities						0.2						—						—						0.2
Total Marketable Securities						111.7						—						—						111.7
Total Assets at Fair Value						$	111.7					$	—					$	—					$	111.7

Fair value of Debt Instruments [Table Text Block]

At December 31, 2024, the fair values were as follows:

(in millions)

Fair Value

Level

$750.0 million fixed rate notes due March 2025

$

747.0

Level 2

$500.0 million fixed rate notes due June 2028

487.1

Level 2

$750.0 million fixed rate notes due March 2032

646.4

Level 2

$750.0 million fixed rate notes due September 2043

752.4

Level 2

$700.0 million fixed rate notes due June 2048

581.1

Level 2

X

- Definition

[Table Text Block] for Fair value of Debt Instruments [Table]

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- Definition

The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 820
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/820/tableOfContent

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