Share-Based Compensation and Capital Stock - Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($) shares
Share-Based Compensation and Capital Stock [Line Items]
Shares repurchased (in shares) \| shares	354,646
Cost of shares repurchased \| $	$ 27.3
Shares redeemed for tax withholding for share based compensation (in shares) \| shares	59,431
Payments related to tax withholding for share-based compensation \| $	$ 4.7
Performance Vested Restricted Stock Units \| Minimum
Share-Based Compensation and Capital Stock [Line Items]
Vesting service period of shares granted	36 months
Performance period, percent	0.00%
Performance Vested Restricted Stock Units \| Maximum
Share-Based Compensation and Capital Stock [Line Items]
Vesting service period of shares granted	48 months
Performance period, percent	200.00%
Restricted stock \| Minimum
Share-Based Compensation and Capital Stock [Line Items]
Performance period, duration	36 months
Restricted stock \| Maximum
Share-Based Compensation and Capital Stock [Line Items]
Performance period, duration	48 months

Share-based Compensation Arrangement by Share-based Payment Award, Performance Period

No definition available.

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- Definition

Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Name Accounting Standards Codification
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-Paragraph 2
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- Definition

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.

+ References

No definition available.

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

+ Details

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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