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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring | Financial Instruments Recorded at Fair Value (in millions):
| September 30, 2025 |  | December 31, 2024
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 1,631.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,631.8 |  |  | $ | 671.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 671.4 |
Deferred compensation asset (a) | 0.5 |  |  | — |  |  | — |  |  | 0.5 |  |  | 0.4 |  |  | — |  |  | — |  |  | 0.4 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation obligation (a) | $ | 0.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.5 |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.4 |
(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, 2025 |  | December 31, 2024
| Carrying Value |  | Estimated Fair Value (a) |  | Carrying Value |  | Estimated Fair Value (a)
8.25% Notes | $ | — |  | (b) | $ | — |  |  | $ | 89.6 |  | (b) | $ | 73.6 |
2.25% Convertible Notes | $ | 390.6 |  | (c) | $ | 1,339.8 |  |  | $ | 389.0 |  | (c) | $ | 403.8 |
0% Convertible Notes | $ | 782.9 |  | (d) | $ | 1,270.4 |  |  | $ | — |  | (d) | $ | — |
(a) Estimated fair value is based on bid/ask quotes as of or near the balance sheet date, which are considered Level 2 inputs. (b) As of September 30, 2025, the carrying value of the 8.25% Notes consists of the principal balance of $0 due to the redemption of the 8.25% Notes in March 2025. As of December 31, 2024, 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. (c)As of September 30, 2025 and December 31, 2024, the carrying value of the 2.25% Convertible Notes is net of $11.9 million and $13.5 million of unamortized debt issuance costs, respectively. Refer to Note 6, Debt. (d)As of September 30, 2025 and December 31, 2024, the carrying value of the 0% Convertible Notes is net of $22.1 million and $0 of unamortized debt issuance costs, respectively. Refer to Note 6, Debt.

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