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Stock-Based Compensation Plans - Performance Share Awards and Restricted Stock Units (Details) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($) $ / shares shares
Performance Share Awards |
Change in nonvested units outstanding |
Awards or units granted (in shares) | shares | 0.3
Awards or units granted, Weighted-average grant-date fair value (in dollars per share) | $ / shares | $ 58.68
Other award and unit disclosures |
Lower limit multiple of initial target awards (as a percent) | 0.00%
Upper limit multiple of initial target awards (as a percent) | 150.00%
Unrecognized compensation costs | $ | $ 14.8
Weighted-average service period over which unrecognized compensation costs will be recognized | 1 year 10 months 24 days
Restricted Stock Units |
Change in nonvested units outstanding |
Awards or units granted (in shares) | shares | 1.0
Awards or units granted, Weighted-average grant-date fair value (in dollars per share) | $ / shares | $ 58.68
Other award and unit disclosures |
Unrecognized compensation costs | $ | $ 88.6
Weighted-average service period over which unrecognized compensation costs will be recognized | 2 years 2 months 12 days

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- Definition The lower limit multiple of initial target awards which will be used to determine the actual number of shares to be awarded at the end of each performance period for performance-based awards. + References No definition available. + Details
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- Definition The upper limit multiple of initial target awards which will be used to determine the actual number of shares to be awarded at the end of each performance period for performance-based awards. + References No definition available. + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 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 grants made 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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- 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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