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

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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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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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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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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.

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