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Equity - Performance shares (Details) $ / shares in Units, shares in Thousands, $ in Millions | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) item $ / shares shares | Dec. 31, 2018 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($)
Share-based compensation |  |  |  |  |  |
Share-based payments subject to redemption | $ | $ 27.0 | $ 37.0 | $ 23.0 | $ 31.0 | $ 25.0 | $ 21.0
Performance Shares |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Number of tranches | item | 2 |  |  |  |  |
Vesting terms |  | 3 years |  |  |  |
Granted (in shares) | shares | 81 |  |  |  |  |
Weighted-average fair value per share, Granted (in dollars per share) | $ / shares | $ 94.48 |  |  |  |  |
Unrecognized compensation cost | $ | $ 8.0 |  |  |  |  |
Remaining requisite service period (in years) | 2 years 2 months 12 days |  |  |  |  |
Cancelled (in shares) | shares | 0 |  |  |  |  |
Market-based performance shares |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Percentage of share-based compensation award | 50.00% |  |  |  |  |
Performance shares calculation period (in years) | 3 years |  |  |  |  |
Vesting terms | 3 years |  |  |  |  |
Market-based performance shares | Minimum |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Performance shares available for vesting (as a percent) | 0.00% |  |  |  |  |
Market-based performance shares | Maximum |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Performance shares available for vesting (as a percent) | 200.00% |  |  |  |  |
Internal-based performance based |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Percentage of share-based compensation award | 50.00% |  |  |  |  |
Performance shares calculation period (in years) | 3 years |  |  |  |  |
Vesting terms | 3 years |  |  |  |  |
Internal-based performance based | Minimum |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Performance shares available for vesting (as a percent) | 0.00% |  |  |  |  |
Internal-based performance based | Maximum |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Performance shares available for vesting (as a percent) | 200.00% |  |  |  |  |
Performance Shares Award Granted in 2017 |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Award pay out achieved (as a percent) | 0.00% |  |  |  |  |

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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 Number of tranches in share-based compensation award type. + References No definition available. + Details
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- Definition Percentage of share-based compensation award. + 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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- 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. + Details
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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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