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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation Stock-based compensation expense for the three months ended March 31, 2021 and 2020 is shown in the table below (in millions):
| Three Months Ended March 31,
| 2021 |  | 2020
Stock options | $ | 0.6 |  |  | $ | 0.6 |
Time-based restricted share units | 1.8 |  |  | 0.9 |
Performance-based restricted share units | 0.6 |  |  | 0.9 |
Employee stock purchase plan | 0.1 |  |  | 0.1 |
Total stock-based compensation | $ | 3.1 |  |  | $ | 2.5 |

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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