Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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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.

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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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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 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 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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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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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.

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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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Percentage of vesting of share-based compensation awards.

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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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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	4,900,000
Shares remaining available for issuance (in shares)	1,900,000
Share-based compensation expense	$ 13.0	$ 15.0	$ 14.0
Intrinsic value of options	1.0	0.0	0.0
Excess tax benefit of options exercised	$ 0.4	$ 0.0	$ 0.0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Weighted-average fair value of options granted (in dollars per share)	$ 9.07	$ 7.70	$ 15.15
Costs not yet recognized	$ 4.0
Costs not yet recognized, period for recognition	1 year
Volatility		26.00%
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Costs not yet recognized	$ 4.0
Costs not yet recognized, period for recognition	1 year
Shares granted (in dollars per share)	$ 38.16
Total shareholder return restricted share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Costs not yet recognized	$ 6.0
Costs not yet recognized, period for recognition	2 years
Vesting period	3 years
Volatility	25.00%	25.00%
Shares granted (in dollars per share)	$ 42.24	$ 38.64
First 12-month period \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	30.00%
Second 12-month period \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	30.00%
Third 12-month period \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	40.00%
Continuing Operations
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 12.0	$ 14.0	$ 13.0
Continuing Operations \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	3.0	5.0	6.0
Continuing Operations \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	4.0	5.0	$ 8.0
Continuing Operations \| Total shareholder return restricted share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 5.0	$ 4.0