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Shareholders' Equity - Schedule of Own Shares held by ESOP (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 209.1	$ 167.1	$ 174.4
Utilization of ESOP shares	(1.0)	(1.5)	(1.3)
Ending balance	207.3	209.1	167.1
Own shares held by ESOP
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1.1)	(1.4)	(1.7)
Utilization of ESOP shares	0.1	0.3
Ending balance	$ (1.0)	$ (1.1)	$ (1.4)

X

- Definition

Stock Issued During Period, Value, Shares From Employee Stock Ownership Plan To Satisfy Share Based Compensation

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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