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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Represents the amount of additional share based compensation expense expected to be recognized in next twelve months.

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Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP).

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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Percentage employer matches of the employee's percentage contribution matched.

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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