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New Accounting Pronouncements (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity	$ (629.2)	$ (502.4)
Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity			$ (4.8)
Adjustment | Retained Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity		$ (0.5)	4.0
Adjustment | Retained Deficit | Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity			12.0
Adjustment | Retained Deficit | Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity			$ (0.2)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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