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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No definition available.

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

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No definition available.

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Stock Option Retirement Contractual Period.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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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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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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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				$ 0.8
Aggregate intrinsic value of options exercised				$ 0.5	$ 1.1	$ 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				1,146,440
Shares issued for long term incentive plan	33,425	25,899	26,146
Cash payments in connection with long term incentive plan	$ 1.3	$ 1.0	$ 0.8
Deferred compensation expense				$ 0.8	2.6	2.7
Vesting period				3 years
Additional share based compensation expense expected to be recognized in next twelve months				$ 0.2
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	26,774
Cash payments in connection with long term incentive plan	$ 1.4	$ 1.9	$ 1.9
Deferred compensation expense				3.4	2.6	3.3
Additional share based compensation expense expected to be recognized in next twelve months				0.8
Additional share based compensation expense expected to be recognized in two years				0.3
Phantom Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation expense				4.8	4.9	3.8
Compensation cost not yet recognized				$ 9.6
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				$ 0.5
Compensation cost not yet recognized				$ 1.8
Minimum [Member] \| Long Term Incentive Plan [Member] \| Management [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%
Maximum [Member] \| Long Term Incentive Plan [Member] \| Management [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%
Pension Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation plan expense				$ 6.3	5.9	5.5
Pension Plans [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of employee contribution matched by the Company				50.00%
Pension Plans [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of employee contribution matched by the Company				100.00%
Profit Sharing Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation plan expense				$ 3.2	$ 2.6	$ 2.9