Stock-Based Compensation - Stock Award Information and Fair Value Assumptions (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock-based compensation expense
Pre-tax compensation expense	$ 20.7	$ 16.5	$ 18.4
Income tax benefit	$ 12.5
Executive Incentive Program
Stock-based compensation
Shares available for grant under the plan (in shares)	4,200,000
Shares available for issuance under the plan (in shares)	3,300,000
Stock options
Stock-based compensation
Awards granted (in shares)	364,675
Stock-based compensation expense
Pre-tax compensation expense	$ 7.7	$ 6.1	$ 5.1
Vesting period	3 years
Maximum term life	10 years
Unrecognized compensation cost related to stock options	$ 5.1
Weighted average period of recognition of unrecognized compensation cost related to stock options	1 year 10 months 13 days
Weighted-average assumptions used to estimate grant date fair value of stock options
Expected dividend yield (as a percent)	1.30%	1.40%	1.10%
Expected life in years	5 years 6 months 29 days	5 years 7 months 9 days	5 years 8 months 15 days
Expected volatility (as a percent)	25.60%	27.50%	27.30%
Risk-free interest rate (as a percent)	1.90%	1.40%	1.40%
Weighted average grant date fair value (in dollars per share)	$ 24.57	$ 19.30	$ 21.19
Fair value of options granted	$ 8.8	$ 7.2	$ 6.7
Intrinsic value of options exercised	8.5	56.4	42.7
Fair value of options vested	$ 5.4	4.7	4.6
Restricted stock awards
Stock-based compensation
Awards granted (in shares)	91,098
Stock-based compensation expense
Pre-tax compensation expense	$ 6.0	4.5	5.9
Vesting period	3 years
Unrecognized compensation cost related to stock options	$ 9.0
Weighted average period of recognition of unrecognized compensation cost related to stock options	2 years 1 month 6 days
Performance share awards
Stock-based compensation
Awards granted (in shares)	47,285
Stock-based compensation expense
Pre-tax compensation expense	$ 5.6	$ 4.7	$ 6.3
Vesting period	3 years
Unrecognized compensation cost related to stock options	$ 6.7
Weighted average period of recognition of unrecognized compensation cost related to stock options	1 year 7 months 28 days
Performance share awards \| 2016 Awards
Stock-based compensation
Awards granted (in shares)	47,285
Restricted Stock Units
Stock-based compensation
Awards granted (in shares)	13,399	14,359	12,157
Stock-based compensation expense
Pre-tax compensation expense	$ 1.4	$ 1.2	$ 1.1
Weighted-average assumptions used to estimate grant date fair value of stock options
Fair value of options granted	$ 26.8

Represents the number of shares available for issuance under the equity-based compensation plan.

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Represents the aggregate grant-date fair value of share-based compensation plan awards to be expensed over the requisite period.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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 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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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 share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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