Stock-Based Compensation Plans - Stock Options Narrative (Details) - Stock options $ in Millions |
3 Months Ended | 9 Months Ended |
|---|---|---|
|
Sep. 30, 2020
USD ($)
|
Sep. 30, 2020
USD ($)
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Vesting percentage per year | 25.00% | |
| Vesting period | 4 years | |
| Contractual term | 10 years | |
| Compensation expense for stock options | $ 1.9 | $ 4.1 |
| Unrecognized compensation cost related to unvested options | $ 22.3 | $ 22.3 |
| Unrecognized compensation cost related to unvested options, weighted-average period of recognition | 3 years 5 months 8 days |