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Stock-Based Compensation Plans - Market Stock Units (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Number of Market Stock Units |  |
Outstanding on December 31, 2019 (in shares) | 139,643 |
Granted (in shares) | 21,648 |
Exchanged for stock (in shares) | (24,035) |
Outstanding on December 31, 2020 (in shares) | 137,256 | 139,643
Maximum Shares Potentially Issuable |  |
Outstanding on December 31, 2019 (in shares) | 199,303 |
Granted (in shares) | 32,472 |
Exchanged for stock (in shares) | (36,052) |
Outstanding on December 31, 2020 (in shares) | 195,723 | 199,303
MSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options expense | $ 0.7 | $ 1.2
Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Potential Shares From MSU Vest | 0.00% |
Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Potential Shares From MSU Vest | 150.00% |
Trading days | 60 days |

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