Employee Benefit Plans (Restricted Stock Units) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	358,000.0	314,900	392,800
Period of increments vested	4 years
Compensation expense	$ 32.5	$ 26.2	$ 24.8
Total unrecognized compensation expense related to outstanding restricted stock units and restricted shares	$ 32.5
Weighted average period for compensation expense recognition	2 years 7 months 6 days
Restricted Stock Unit Earned As Dividend Equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	19,049	26,907	29,273
Director \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	26,328	29,331	35,376
Executives and Employees \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded (in shares)	312,602	258,661	328,142
Chief Executive Officer \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 6.0

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

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