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Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Amounts owed to employees participating in the deferred compensation plan | $ 2.6 | $ 2.8
Liability fair value | 0.0 | $ 0.0
Fair Value, Inputs, Level 2 | Convertible Notes | Convertible Senior Notes due 2024 |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of debt | 30.5 |
Fair Value, Inputs, Level 2 | Convertible Notes | Convertible Senior Notes Due 2026 |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of debt | 197.2 |
Fair Value, Inputs, Level 2 | Convertible Notes | Convertible Senior Notes Due 2027 |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of debt | $ 285.1 |

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