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Share-Based Compensation - Restricted Stock Units (Details) - Restricted Stock Units $ / shares in Units, $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($) $ / shares shares
RSU Activity |
Outstanding at the beginning of the period (in shares) | shares | 750,821
Granted (in shares) | shares | 298,338
Vested (in shares) | shares | (74,934)
Forfeited (in shares) | shares | (10,126)
Outstanding at the end of the period (in shares) | shares | 964,099
Weighted-Average Grant-Date Fair Value |
Outstanding at the beginning of the period (in dollars per share) | $ / shares | $ 60.88
Granted (in dollars per share) | $ / shares | 81.16
Vested (in dollars per share) | $ / shares | 60.47
Forfeited (in dollars per share) | $ / shares | 62.37
Outstanding at the end of the period (in dollars per share) | $ / shares | $ 67.27
Additional disclosures |
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted | $ | $ 32.5
Weighted-average period over which unrecognized compensation cost is expected to be recognized | 1 year 9 months 18 days
Total fair value of shares vested during the period | $ | $ 4.5
Minimum |
Share-Based Compensation |
Vesting period | 2 years
Maximum |
Share-Based Compensation |
Vesting period | 4 years
Tranche One |
Share-Based Compensation |
Performance period | 3 years
Tranche Two | Minimum |
Share-Based Compensation |
Performance period | 1 year
Tranche Two | Maximum |
Share-Based Compensation |
Performance period | 2 years

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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