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Incentive Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Deferred compensation expense | $ 6.2 | $ 6.5 | $ 6.8
Profit Sharing Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Deferred compensation expense | $ 4.8 | 3.6 | 3.7
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] |  |  |
Number of shares authorized (in shares) | 1,070,820 |  |
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 | $ 3.1 | 2.4 |
Compensation expense | 3.7 | 4.8 | 4.9
Net impact to earnings | 2.6 | 3.4 | 3.5
Additional share based compensation expense expected to be recognized in next twelve months | 1.4 |  |
Additional share based compensation expense expected to be recognized in two years | 0.3 |  |
Phantom Share Units (PSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | 6.6 | 5.4 | 6.3
Net impact to earnings | $ 4.6 | 3.9 | 4.5
Vesting period | 5 years |  |
Compensation cost not yet recognized | $ 15.0 |  |
Cost not yet recognized, period for recognition | 2 years |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 0.6 | 0.4 | 1.1
Net impact to earnings | 0.4 | $ 0.3 | $ 0.8
Compensation cost not yet recognized | 0.2 |  |
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | 0.6 |  |
Net impact to earnings | $ 0.4 |  |

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