Share-Based Arrangements (Restricted Stock Activity) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock
Restricted Stock, Outstanding [Roll Forward]
Outstanding at beginning of period (in shares)	143,697
Granted (in shares)	63,804
Vested (in shares)	(108,517)
Forfeited or expired (in shares)	(6,184)
Outstanding at end of period (in shares)	92,800	143,697
Restricted Stock, Weighted-Average Grant Date Fair Value [Roll Forward]
Outstanding at beginning of period (in dollars per share)	$ 49.97
Granted (in dollars per share)	60.86
Vested (in dollars per share)	52.81
Forfeited or expired (in dollars per share)	57.62
Outstanding at end of period (in dollars per share)	$ 53.63	$ 49.97
Total fair value of restricted stock awards vested	$ 6.5	$ 3.6	$ 5.7
Nonqualified Stock Options and Restricted Stock
Restricted Stock, Weighted-Average Grant Date Fair Value [Roll Forward]
Tax benefit from compensation expense	1.6	$ 1.4	$ 2.0
Compensation cost not yet recognized	$ 4.1
Compensation cost recognized, period	3 years 1 month 6 days

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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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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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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