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Shareholders' Equity - Schedule of Own Shares held by ESOP (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 207.3	$ 209.1	$ 167.1
Utilization of ESOP shares	(0.3)	(1.0)	(1.5)
Ending balance	212.6	207.3	209.1
Own shares held by ESOP
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1.0)	(1.1)	(1.4)
Utilization of ESOP shares	0.1	0.1	0.3
Ending balance	$ (0.9)	$ (1.0)	$ (1.1)

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- Definition

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

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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

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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