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Incentive Plans (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension plans |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | $ 6.5 | $ 6.8 | $ 6.3
Profit Sharing Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred compensation expense |  |  |  | $ 3.6 | 3.7 | 3.2
Minimum | Pension plans |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Employer matching contribution, percent of match |  |  |  | 50.00% |  |
Maximum | Pension plans |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Employer matching contribution, percent of match |  |  |  | 100.00% |  |
Long Term Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cash payments in connection with long term incentive plan | $ 0.7 | $ 1.0 | $ 1.3 |  |  |
Vesting period |  |  |  | 3 years |  |
Compensation expense |  |  |  | $ 0.8 |  |
Shares issued for long term incentive plan (in shares) | 12,930 | 25,473 | 33,425 |  |  |
Number of shares authorized (in shares) |  |  |  | 1,102,542 |  |
Long Term Incentive Plan | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 1 year |  |
Long Term Incentive Plan | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Long Term Incentive Plan | Management |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cash payments in connection with long term incentive plan |  |  |  | $ 2.4 | 1.5 |
Compensation expense |  |  |  | 4.8 | 4.9 | 3.4
Additional share based compensation expense expected to be recognized in next twelve months |  |  |  | 1.1 |  |
Additional share based compensation expense expected to be recognized in two years |  |  |  | $ 0.4 |  |
Phantom Share Units (PSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 5 years |  |
Compensation expense |  |  |  | $ 5.4 | 6.3 | 4.8
Compensation cost not yet recognized |  |  |  | $ 11.0 |  |
Cost not yet recognized, period for recognition |  |  |  | 2 years |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense |  |  |  | $ 0.4 | $ 1.1 | $ 0.5
Compensation cost not yet recognized |  |  |  | $ 1.5 |  |
2011 Multi-Year Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |

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