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Shareholders' Equity - Schedule of Own Shares held by ESOP (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 167.1	$ 174.4	$ 184.3
Shares sold from ESOP		1.1	3.5
Utilization of ESOP shares	(1.5)	(1.3)	(4.6)
Ending balance	209.1	167.1	174.4
Own shares held by ESOP
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1.4)	(1.7)	(2.2)
Shares sold from ESOP		0.3	0.2
Utilization of ESOP shares	0.3		0.3
Ending balance	$ (1.1)	$ (1.4)	$ (1.7)

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Shares Sold During Period, Value, Employee Stock Ownership Plan

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

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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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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
-Publisher FASB
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