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Equity - Performance shares (Details) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) item $ / shares shares | Dec. 31, 2020 item | Dec. 31, 2019 item | Dec. 31, 2018
Performance Shares |  |  |  |
Share-based compensation |  |  |  |
Vesting terms |  |  |  | 3 years
Number of tranches | item |  | 2 | 2 |
Granted (in shares) | shares | 108 |  |  |
Weighted-average fair value per share, Granted (in dollars per share) | $ / shares | $ 100.29 |  |  |
Unrecognized compensation cost | $ | $ 12.0 |  |  |
Remaining requisite service period (in years) | 2 years 6 months |  |  |
Cancelled (in shares) | shares | 2 |  |  |
Performance shares, vesting based on TSR |  |  |  |
Share-based compensation |  |  |  |
Vesting terms | 3 years |  |  |
Percentage of share-based compensation award |  | 50.00% | 50.00% |
Performance shares calculation period (in years) | 3 years |  |  |
Performance shares, vesting based on TSR | Minimum |  |  |  |
Share-based compensation |  |  |  |
Performance shares available for vesting (as a percent) | 0.00% |  |  |
Performance shares, vesting based on TSR | Maximum |  |  |  |
Share-based compensation |  |  |  |
Performance shares available for vesting (as a percent) | 200.00% |  |  |
Performance shares, vesting based on Adjusted ROIC |  |  |  |
Share-based compensation |  |  |  |
Vesting terms | 3 years |  |  |
Percentage of share-based compensation award |  | 50.00% | 50.00% |
Performance shares calculation period (in years) | 3 years | 3 years | 3 years |
Performance shares, vesting based on Adjusted ROIC | Minimum |  |  |  |
Share-based compensation |  |  |  |
Performance shares available for vesting (as a percent) | 0.00% |  |  |
Performance shares, vesting based on Adjusted ROIC | Maximum |  |  |  |
Share-based compensation |  |  |  |
Performance shares available for vesting (as a percent) | 200.00% |  |  |
2018 Awards | Performance Shares |  |  |  |
Share-based compensation |  |  |  |
Award pay out achieved (as a percent) | 0.00% |  |  |
2021 Awards | Performance Shares |  |  |  |
Share-based compensation |  |  |  |
Number of award segments | item | 2 |  |  |
2021 Award, Segment One | Performance shares, vesting based on TSR |  |  |  |
Share-based compensation |  |  |  |
Percentage of share-based compensation award | 50.00% |  |  |
2021 Award, Segment One | Performance shares, vesting based on Adjusted ROIC |  |  |  |
Share-based compensation |  |  |  |
Percentage of share-based compensation award | 50.00% |  |  |
Performance shares calculation period (in years) | 3 years |  |  |
2021 Award, Segment Two | Performance shares, vesting based on Adjusted ROIC |  |  |  |
Share-based compensation |  |  |  |
Percentage of share-based compensation award | 100.00% |  |  |

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- Definition The length of time used to calculate the final payments for performance shares. + References No definition available. + Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -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 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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