Deferred compensation plan maximum incentive bonus contribution per employee percent.

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- Definition

Minimum required sum of the participant’s age and years of service.

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Minimum required participant age with five years service.

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- Definition

Share based compensation arrangement by share based payment number of plans.

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No definition available.

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- Definition

Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned.

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- Definition

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

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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No definition available.

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- Definition

Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

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- Definition

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

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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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- Definition

Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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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- 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.

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No definition available.

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- Definition

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 Based Compensation Plans and Other Benefit Plans - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) CompensationPlan shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of compensation plans \| CompensationPlan	4
Compensation cost not yet recognized	$ 16.5
Period of amortization expected to be recognized	3 years
Non-cash compensation expense	$ 21.5	$ 20.8	$ 23.3
Restricted shares, stock compensation expense	$ 3.1	1.5
Percentage of incentive bonus contribution	85.00%
Deferred Compensation Plans
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation, liability	$ 116.9	102.8
Amounts charged to earnings	$ 2.1	1.0	$ 2.4
Shares held in rabbi trust \| shares	169,000
Deferred Compensation Plans \| Other Assets
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Funded balances	$ 101.4	98.2
Deferred Compensation Plans \| Management
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of compensation contribution	85.00%
Deferred Compensation Plans \| Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of compensation contribution	100.00%
Exercise Options Granted Between Two Thousand Seven Through Two Thousand Seventeen Within Three Year From Date Of Termination
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Minimum required participant age and years of service	65 years
Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock exercise period, years	10 years
Vesting period	3 years
Minimum service period, years	5 years
Minimum required participant age with five years of service	55 years
Restricted Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation, liability	$ 0.0	$ 3.1