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Shareholders' Equity - Schedule of Own Shares held by ESOP (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 174.4	$ 184.3	$ 174.5
Shares sold from ESOP	1.1	3.5	6.6
Utilization of ESOP shares	(1.3)	(4.2)	0.0
Ending balance	167.1	174.4	184.3
Own shares held by ESOP
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1.7)	(2.2)	(1.0)
Shares sold from ESOP	0.3	0.2	0.4
Utilization of ESOP shares		0.3	1.1
Ending balance	$ (1.4)	$ (1.7)	$ (2.2)

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.

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