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

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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

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- Definition

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

+ References

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- Definition

Number of shares issued pursuant to the terms of a deferred compensation arrangement.

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- Definition

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

+ References

No definition available.

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- Definition

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

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- Definition

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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- Definition

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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- Definition

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.

+ References

No definition available.

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- Definition

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

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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