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

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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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Deferred Compensation Arrangement With Individual, Percent Payable In Common Stock.

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Stock Option Retirement Contractual Period.

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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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Number of shares issued pursuant to the terms of a 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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock Options and Incentive Plans (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended				12 Months Ended
	Jan. 20, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation expense	$ 3.0
Pension Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation plan expense					$ 6.8	$ 6.3	$ 5.9
Profit Sharing Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation plan expense					$ 3.7	3.2	2.6
Minimum [Member] \| Pension Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of employee contribution matched by the Company					50.00%
Maximum [Member] \| Pension Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of employee contribution matched by the Company					100.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of stock options, in years					20 years
Length of time options are valid after retirement, in years					10 years
Aggregate intrinsic value of vested options					$ 0.7
Aggregate intrinsic value of options exercised					$ 1.1	0.4	0.5
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of stock authorized for payment of awards					1,115,472
Shares issued for long term incentive plan		25,473	33,425	25,899
Cash payments in connection with long term incentive plan		$ 1.0	$ 1.3	$ 1.0
Deferred compensation expense						0.8	2.6
Vesting period					3 years
Long Term Incentive Plan [Member] \| Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for long term incentive plan			10,751	18,784
Cash payments in connection with long term incentive plan			$ 1.4	$ 1.9
Deferred compensation expense					$ 4.9	3.4	2.6	$ 3.3
Additional share based compensation expense expected to be recognized in next twelve months					0.4
Additional share based compensation expense expected to be recognized in two years					$ 0.2
Long Term Incentive Plan [Member] \| Management [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earned incentive compensation paid in shares of Class A Common Stock					40.00%
Long Term Incentive Plan [Member] \| Management [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earned incentive compensation paid in shares of Class A Common Stock					50.00%
Phantom Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation expense					$ 6.3	4.8	$ 4.9
Compensation cost not yet recognized					$ 11.0
Vesting period					5 years
Compensation cost recognition period					2 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation expense					$ 1.1	$ 0.5
Compensation cost not yet recognized					$ 1.5