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Share Repurchases - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended				12 Months Ended
	Feb. 28, 2022	Dec. 31, 2021	Feb. 28, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 28, 2021	Nov. 01, 2017
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount								$ 1,000.0	$ 500.0
Payment for share repurchase					$ 500.0	$ 300.0	$ 250.0
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	0.2	1.8
Stock repurchase program remaining authorized repurchase amount		$ 729.7			$ 729.7
Commercial Bank
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount				$ 270.0		270.0
Accelerated share repurchases, settlement payment				$ 300.0		$ 300.0
Accelerated share repurchases received			0.4	3.1
Evergreen Program
Accelerated Share Repurchases [Line Items]
Accelerated share repurchases received					3.5
Payment for share repurchase					$ 100.0
Repurchase Program
Accelerated Share Repurchases [Line Items]
Accelerated share repurchases received					2.0
Open market share repurchase		1.8
Open market share repurchase amount		$ 170.3
Payment for share repurchase		$ 70.3

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Accelerated share repurchases settlement shares received.

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

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The cash outflow to reacquire common stock during the period.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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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.

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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.

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