Share-Based Compensation and Capital Stock - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2019
Share-Based Compensation and Capital Stock [Line Items]
Shares repurchased (in shares)	122,237	476,833
Shares redeemed for tax withholding for share based compensation (in shares)	6,938	66,369
Payments related to tax withholding for share-based compensation	$ 9.9	$ 37.2
Cost of shares repurchased	$ 0.6	$ 5.3
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		12 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

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- Definition

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

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-Publisher FASB
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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.

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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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Percentage of vesting of award under share-based payment arrangement.

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- Definition

Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

No definition available.

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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.

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- Definition

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

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