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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2025

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Financial instruments measured at fair value on a recurring basis

The following table presents financial instruments measured at fair value on a recurring basis:

						March 31, 2025
(in millions)						Level 1						Level 2						Level 3						Total
Assets at Fair Value:
Marketable securities:
Corporate debt securities						$	8.5					$	—					$	—					$	8.5
Mutual funds						105.1						—						—						105.1
Equity securities						0.3						—						—						0.3
Total Marketable Securities						113.9						—						—						113.9
Total Assets at Fair Value						$	113.9					$	—					$	—					$	113.9

Fair value of Debt Instruments

At March 31, 2025, the fair values were as follows:

(in millions)			Fair Value						Level
$500.0 million fixed rate notes due June 2028			493.7						Level 2
$750.0 million fixed rate notes due March 2030			749.7						Level 2
$750.0 million fixed rate notes due March 2032			659.1						Level 2
$750.0 million fixed rate notes due September 2043			749.1						Level 2
$700.0 million fixed rate notes due June 2048			589.3						Level 2

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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