Share-Based Compensation and Capital Stock - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020 USD ($) shares	Sep. 30, 2020 USD ($) awardtype shares
Share-Based Compensation and Capital Stock [Line Items]
Shares repurchased (in shares)	0	548,031
Payments related to tax withholding for share-based compensation \| $		$ 43.3
Shares redeemed for tax withholding for share based compensation (in shares)	7,504	123,029
Cost of shares repurchased \| $	$ 0.7	$ 11.9
Performance Vested Restricted Stock Units
Share-Based Compensation and Capital Stock [Line Items]
Types of awards granted \| awardtype		2
Vesting service period of shares granted		31 months
Unvested shares expected to vest (in shares)	230,647
Leveraging factor	0.00%
Performance Vested Restricted Stock Units \| Minimum
Share-Based Compensation and Capital Stock [Line Items]
Performance period, percent		0.00%
Performance Vested Restricted Stock Units \| Maximum
Share-Based Compensation and Capital Stock [Line Items]
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

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Share Based Compensation By Share Based Payment Award, Types of Awards Granted

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Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Unvested Shares Expected to Vest

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

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

+ References

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

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

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

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