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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 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:
|  | September 30, 2025
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets at Fair Value: |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 7.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 7.7 |
Mutual funds |  | 115.3 |  |  | — |  |  | — |  |  | 115.3 |
Equity securities |  | 0.2 |  |  | — |  |  | — |  |  | 0.2 |
Total Marketable Securities |  | 123.2 |  |  | — |  |  | — |  |  | 123.2 |
Total Assets at Fair Value |  | $ | 123.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 123.2 |
Fair value of Debt Instruments | At September 30, 2025, the fair values were as follows:
(in millions) | Fair Value |  | Level
$500.0 million fixed rate notes due June 2028 | $ | 498.9 |  |  | Level 2
$750.0 million fixed rate notes due March 2030 | 759.3 |  |  | Level 2
$750.0 million fixed rate notes due March 2032 | 682.1 |  |  | Level 2
$750.0 million fixed rate notes due September 2043 | 767.6 |  |  | Level 2
$700.0 million fixed rate notes due June 2048 | 596.9 |  |  | Level 2

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