Accelerated share repurchases settlement shares received.

No definition available.

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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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Period Type:	duration

- Definition

Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

The cash outflow to reacquire common stock during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Balance Type:	debit
Period Type:	duration

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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- Details

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Share Repurchases - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended				3 Months Ended	12 Months Ended
	Feb. 28, 2021	Sep. 30, 2019	Jan. 31, 2019	Nov. 30, 2017	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Nov. 01, 2017
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount									$ 500.0
Open market share repurchase		$ 150.0	$ 100.0
Stock purchases, shares					4.1
Payment for share repurchase					$ 200.0	$ 300.0	$ 250.0	$ 200.0
Commercial Bank
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount						270.0
Remaining amount for share repurchase program						210.0
Accelerated share repurchases, settlement payment						$ 300.0
Accelerated share repurchases received						3.1
Commercial Bank \| Subsequent Event
Accelerated Share Repurchases [Line Items]
Accelerated share repurchases received	0.4
Evergreen Program
Accelerated Share Repurchases [Line Items]
Payment for share repurchase		50.0			110.0
Accelerated share repurchases received						3.5
Repurchase Program
Accelerated Share Repurchases [Line Items]
Open market share repurchase				$ 100.0
Payment for share repurchase		$ 100.0			$ 90.0
Remaining amount for share repurchase program						$ 210.0