Percentage of maximum amount available for issuance.

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Term of treasury issues.

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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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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No definition available.

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

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Percentage of vesting of award under share-based payment arrangement.

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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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Expected term of 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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Stock Compensation Plans (Textual) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 22, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized	$ 10.2	$ 16.2	$ 6.6
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General vesting period of options granted	3 years
Restricted Stock Awards \| Year 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting rights, percentage	33.33%
Restricted Stock Awards \| Year 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting rights, percentage	33.33%
Restricted Stock Awards \| Year 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting rights, percentage	33.33%
EPS PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General vesting period of options granted	3 years
EPS PSUs \| Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of maximum amount available for issuance	10.00%	0.00%	0.00%
TSR PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General vesting period of options granted	3 years
Unrecognized compensation cost	$ 1.8
Unrecognized compensation cost, recognition period	1 year 6 months
Expected term (in years)	2 years 9 months 29 days	2 years 9 months 29 days
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized to grant under LT Plan (in shares)	230,000
Number of shares remained available (in shares)	173,000
Expected term (in years)	1 year	1 year	1 year
Term of treasury issues	1 year
The 2019 LT Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized to grant under LT Plan (in shares)				2,300,000
Number of shares remained available (in shares)	1,000,000.0
The 2019 LT Plan \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of awards	7 years
The 2019 LT Plan \| Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 3.5
Unrecognized compensation cost, recognition period	1 year 3 months 18 days
The 2019 LT Plan \| EPS PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 0.2
Unrecognized compensation cost, recognition period	1 year 4 months 24 days
Lansing Trade Group LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized	$ 4.3	$ 9.4