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Shareholders' Equity - Schedule of Treasury Shares (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Movement In Treasury Shares [Roll Forward]
Beginning balance	$ 167.1	$ 174.4	$ 184.3
Purchase of treasury shares	(6.4)
Cancellation of treasury shares	0.0
Utilization of treasury shares to satisfy share based compensation	0.0	(0.1)	0.2
Ending balance	209.1	167.1	174.4
Treasury shares
Movement In Treasury Shares [Roll Forward]
Beginning balance	(4.0)	(4.0)	(4.3)
Purchase of treasury shares	(6.4)
Cancellation of treasury shares	0.7
Utilization of treasury shares to satisfy share based compensation	0.1		0.3
Ending balance	$ (9.6)	$ (4.0)	$ (4.0)

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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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Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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