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Share Repurchases - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Feb. 28, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | Oct. 28, 2021
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 1,000.0
Payment for share repurchase |  |  | $ 0.0 | $ 54.9 |  |
Commercial Bank |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 180.0 |  |  |  | $ 180.0 |
Accelerated share repurchases, settlement payment | $ 200.0 |  |  |  | $ 200.0 |
Accelerated share repurchases received | 1,800,000 | 200,000 |  |  |  |
Evergreen Program |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Payment for share repurchase | $ 100.0 |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Open market share repurchase | 1,800,000 |  |  |  |  |
Open market share repurchase amount | $ 170.3 |  |  |  |  |
Accelerated share repurchases received |  |  |  |  | 2,000,000.0 |
Stock repurchased during period, shares |  |  | 729,700,000 |  |  |
Payment for share repurchase | $ 70.3 |  |  |  |  |

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- 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 https://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern 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 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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