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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2024
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:
|  | June 30, 2024
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets at Fair Value: |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 9.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 9.7 |
Mutual funds |  | 111.8 |  |  | — |  |  | — |  |  | 111.8 |
Equity securities |  | 0.2 |  |  | — |  |  | — |  |  | 0.2 |
Total Marketable Securities |  | 121.7 |  |  | — |  |  | — |  |  | 121.7 |
Total Assets at Fair Value |  | $ | 121.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 121.7 |
Fair value of Debt Instruments | At June 30, 2024, the fair values were as follows:
(in millions) | Fair Value |  | Level
$750.0 million fixed rate notes due March 2025 | $ | 738.1 |  |  | Level 2
$500.0 million fixed rate notes due June 2028 | 482.1 |  |  | Level 2
$750.0 million fixed rate notes due March 2032 | 643.6 |  |  | Level 2
$750.0 million fixed rate notes due September 2043 | 753.9 |  |  | Level 2
$700.0 million fixed rate notes due June 2048 | 607.8 |  |  | Level 2

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