Required target average common stock trading price for vesting restricted stock units.

No definition available.

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- Definition

Share-based compensation arrangement by share-based payment award, equity instruments other than options, not yet met market condition to vest, number.

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Terms, Minimum Percentage Of Units To Vest

+ References

No definition available.

+ 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

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, 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 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ 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 (d)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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Balance Type:	debit
Period Type:	duration

- 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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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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Employee Compensation and Benefit Plans - Schedule of Stock Unit Activity (Footnote) (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Former Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	25,168
Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		150,000	75,377	65,534
Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		150,000	83,797	120,625
Intrinsic value of stock units vested		$ 1.0	$ 2.1	$ 3.3
Total intrinsic value of stock units vested		$ 2.7	$ 3.5	$ 2.2
Unvested stock units (in shares)		261,647	177,275	196,453	183,595
Minimum percentage of units to vest (percent)		50.00%
Weighted average remaining contractual term of share units outstanding (years)		1 year 4 months 24 days
Market-based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock units (in shares)		125,395
Net aggregate intrinsic value of stock awards outstanding		$ 3.9
Share-based Payment Arrangement, Tranche One \| Market-based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average common stock trading price (USD per share)		$ 175.80
Stock units with market condition not met, number		2,666
Share-based Payment Arrangement, Tranche Two \| Market-based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average common stock trading price (USD per share)		$ 87.00
Stock units with market condition not met, number		6,201
Share-based Payment Arrangement, Tranche Three \| Market-based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average common stock trading price (USD per share)		$ 65.10
Stock units with market condition not met, number		3,840
Share-Based Payment Arrangement, Tranche Four \| Market-based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average common stock trading price (USD per share)		$ 38.34
Stock units with market condition not met, number		37,688
Share-Based Payments Arrangement, Tranche Five \| Market-based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units with market condition not met, number		75,000