Employee Benefit Plans (Restricted Stock Units) (Details) $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($) annual_installment shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	314,900	392,800	467,400
Number of annual vesting installments \| annual_installment	4
Period of increments vested	4 years
Compensation expense \| $	$ 26.2	$ 24.8	$ 24.4
Total unrecognized compensation expense related to outstanding restricted stock units and restricted shares \| $	$ 36.3
Weighted average period for compensation expense recognition	2 years 4 months 24 days
Restricted Stock Unit Earned As Dividend Equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	26,907	29,273	35,071
Director \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	29,331	35,376	36,855
Executives and Employees \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	258,661	328,142	395,495

Share-based Compensation Arrangement by Share-based Payment Award, Number of Annual Vesting Installments

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

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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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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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