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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2024
Fair Value Disclosures [Abstract] |
Schedule of Financial Instruments Recorded at Fair Value | Financial Instruments Recorded at Fair Value (in millions):
| September 30, 2024 |  | December 31, 2023
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 194.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 194.3 |  |  | $ | 201.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 201.2 |
Deferred compensation asset (a) | 0.4 |  |  | — |  |  | — |  |  | 0.4 |  |  | 3.3 |  |  | — |  |  | — |  |  | 3.3 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation obligation (a) | $ | 0.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | 3.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 3.3 |
(a) The deferred compensation obligation represents the balance of deferred compensation plus net investment earnings. The deferred compensation plan is funded through a rabbi trust. Trust funds are invested in mutual funds for which unit prices are quoted in active markets and are classified within Level 1 of the valuation hierarchy.
Fair Value Option, Disclosures | The carrying value and estimated fair value of long-term debt were as follows (in millions):
| September 30, 2024 |  | December 31, 2023
| Carrying Value |  | Estimated Fair Value (a) |  | Carrying Value |  | Estimated Fair Value (a)
8.25% Notes | $ | 89.6 |  | (b) | $ | 73.8 |  |  | $ | 95.7 |  | (b) | $ | 71.7 |
(a) Based on bid/ask quotes as of or near the balance sheet date, which are considered Level 2 inputs. (b) The carrying value of the 8.25% Notes consists of the principal balance of $74.3 million and the sum of current and noncurrent interest payment obligations until maturity. Refer to Note 6, Debt.

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