Equity - Performance shares (Details) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($) item $ / shares shares
Performance Shares
Share-based compensation
Number of tranches \| item	2
Granted (in shares)	70
Weighted-average fair value per share, Granted (in dollars per share) \| $ / shares	$ 92.57
Unrecognized compensation cost \| $	$ 7.0
Remaining requisite service period (in years)	2 years 3 months 18 days
Cancelled (in shares)	3
Market-based performance shares
Share-based compensation
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 based	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 2016
Share-based compensation
Award pay out achieved (as a percent)	0.00%

Represents the vesting percentage achieved.

No definition available.

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- Definition

The length of time used to calculation the final payments for performance shares.

+ References

No definition available.

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- Definition

Number of tranches in share-based compensation award type.

+ References

No definition available.

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- Definition

Percentage of share-based compensation award based.

+ References

No definition available.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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
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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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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

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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

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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.

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- Definition

Percentage of vesting of share-based compensation awards.

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