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Share Based Compensation Arrangement by Share Based Payment Award, Employee Stock Purchase Plan, Offering Period

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Target Award, Percentage

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Share Based Compensation Arrangement By Share Based Payment Award Expiry Period From Date Of Grant

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Share Based Compensation Arrangement By Share Based Payment Award Performance Period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Conversion Ratio

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- Definition

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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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

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

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

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- Definition

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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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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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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- Definition

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

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- Definition

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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Capital Stock and Equity Compensation (Additional Information) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) offering_periods	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Anniversary period from grant date	13 months
Total intrinsic value of options exercised in period	$ 2.4	$ 6.0
Cash received from exercise of options exercised	$ 0.9	$ 3.1
Weighted-Average Remaining Contractual Life in Years, Options outstanding	2 years	2 years 2 months
Aggregate Intrinsic Value, Options outstanding	$ 0.7	$ 4.2
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 0.3	0.5
Employee stock purchase plan number of offering periods \| offering_periods	2
Employee stock purchase plan length of offering periods	6 months
Discount from market price percentage	15.00%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement period	3 years
Expected dividend yield	0.00%
Compensation expense	$ 4.4	4.7	$ 4.6
Nonvested awards, total compensation cost not yet recognized	$ 6.0
Future compensation cost, period of recognition	10 months 24 days
Performance Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)	0.00%
Performance Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)	200.00%
Time Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 5.6	5.7	5.6
Nonvested awards, total compensation cost not yet recognized	$ 6.7
Future compensation cost, period of recognition	10 months 24 days
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 0.9	$ 1.0	$ 0.7
Anniversary period from grant date	13 months
Converstion ratio	1
Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, contractual term (years)	10 years