Share-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock authorized for issuance under the plan (in shares)	30,200,000
Capital shares reserved for future issuance (in shares)	2,100,000
Share-based payment award, expiration period	10 years
Tax benefit from compensation expense	$ 5.1	$ 3.7	$ 4.0
Share-based compensation expense, after-tax	19.1	14.1	14.9
Cash related stock options exercises	$ 9.4	$ 7.9	$ 24.7
Black Scholes valuation assumptions for stock option grants [Abstract]
Options granted, weighted-average grant-date fair value (in dollars per share)	$ 33.53	$ 28.31	$ 20.28
Number of Options Granted But Not Exercised
Options exercisable (in shares)	672,000	605,000	388,000	628,000
Options vested and expected to vest (in shares)	607,000	622,000	818,000	835,000
Beginning (in shares)	1,254,000	1,235,000	1,504,000
Granted (in shares)	248,000	235,000	302,000
Exercised (in shares)	(166,000)	(166,000)	(549,000)
Forfeited (in shares)	(31,000)	(50,000)	(22,000)
Ending (in shares)	1,305,000	1,254,000	1,235,000	1,504,000
Weighted-Average Remaining Contractual Life	6 years 1 month 6 days	6 years 2 months 12 days	7 years	6 years 6 months
Weighted-Average Exercise Price Per Share
Beginning (in dollars per share)	$ 78.95	$ 70.44	$ 58.06
Granted (in dollars per share)	114.90	105.00	92.24
Exercised (in dollars per share)	62.74	49.56	48.02
Forfeited (in dollars per share)	102.32	89.18	81.84
Ending (in dollars per share)	$ 87.35	$ 78.95	$ 70.44	$ 58.06
Aggregate Intrinsic Value (in Millions)
Options outstanding, aggregate intrinsic value	$ 48.9	$ 38.8	$ 54.9	$ 62.8
Options exercised, aggregate intrinsic value	9.6	9.8	31.3
Options exercisable, intrinsic value	$ 36.1
Options exercisable, weighted-average remaining contractual term (in years)	4 years 2 months 12 days
Options exercisable, weighted-average exercise price per share (in dollars per share)	$ 71.15
Discontinued operations, net of income taxes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense, after-tax	$ 0.0	0.0	2.2
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	3 years
Share-based payment award, expiration period	10 years
Tax benefit from compensation expense	$ 1.3	1.0	1.1
Share-based compensation expense, after-tax	$ 4.9	$ 3.7	$ 4.0
Fair value assumptions, forfeiture rate	4.00%
Black Scholes valuation assumptions for stock option grants [Abstract]
Expected dividend yield	1.85%	1.83%	1.91%
Expected volatility	33.18%	32.75%	26.60%
Expected life (in years)	6 years 6 months	6 years 6 months	6 years 6 months
Risk-free interest rate	1.91%	0.92%	1.19%
Aggregate Intrinsic Value (in Millions)
Unrecognized compensation cost	$ 6.5
Unrecognized compensation cost, weighted-average period of recognition (in years)	1 year 8 months 19 days
Restricted Stock Units (RSUs) related to Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock credited to directors' accounts for RSUs (in shares)	284,201	267,524
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	3 years
Tax benefit from compensation expense	$ 2.3	$ 1.9	$ 2.0
Share-based compensation expense, after-tax	$ 8.5	$ 7.2	$ 7.4
Fair value assumptions, forfeiture rate	2.00%
Aggregate Intrinsic Value (in Millions)
Unrecognized compensation cost	$ 11.0
Unrecognized compensation cost, weighted-average period of recognition (in years)	1 year 10 months 20 days
Number of awards
Nonvested awards, beginning (in shares)	270,000	298,000	302,000
Granted (in shares)	103,000	95,000	92,000
Vested (in shares)	(102,000)	(108,000)	(84,000)
Forfeited (in shares)	(14,000)	(15,000)	(12,000)
Nonvested awards, ending (in shares)	257,000	270,000	298,000	302,000
Weighted-Average Grant Date Fair Value Per Share
Nonvested awards, beginning (in dollars per share)	$ 89.56	$ 79.91	$ 67.89
Granted (in dollars per share)	114.50	102.10	91.83
Vested (in dollars per share)	77.80	73.82	50.14
Forfeited (in dollars per share)	102.64	90.05	77.42
Nonvested awards, ending (in dollars per share)	$ 104.54	$ 89.56	$ 79.91	$ 67.89
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit from compensation expense	$ 1.5	$ 0.8	$ 0.9
Share-based compensation expense, after-tax	$ 5.7	$ 3.2	$ 3.5
Number of awards
Nonvested awards, beginning (in shares)	195,000	202,000	206,000
Granted (in shares)	45,000	79,000	111,000
Vested (in shares)	(102,000)	(86,000)	(115,000)
Forfeited (in shares)	(2,000)	0	0
Nonvested awards, ending (in shares)	136,000	195,000	202,000	206,000
Weighted-Average Grant Date Fair Value Per Share
Nonvested awards, beginning (in dollars per share)	$ 96.18	$ 88.48	$ 72.06
Granted (in dollars per share)	140.32	103.26	108.74
Vested (in dollars per share)	83.74	77.44	58.37
Forfeited (in dollars per share)	125.60	0	0
Nonvested awards, ending (in dollars per share)	$ 120.47	$ 96.18	$ 88.48	$ 72.06

Share-based Compensation Arrangement by Share-based Payment Award, Forfeiture Rate Assumption

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Amount, after tax, of expense for award under share-based payment arrangement.

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

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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 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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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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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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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