Goodwill and Intangible Assets - Goodwill Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill	$ 765.9	$ 765.9
Accumulated impairment losses	(674.9)	(674.9)
Preconfirmation, Goodwill	91.0	91.0
Goodwill, net	93.6	91.0
Goodwill, Translation and Purchase Accounting Adjustments	2.6
Postconfirmation, Goodwill	$ 768.5	$ 765.9

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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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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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of goodwill at the balance sheet date after fresh-start adjustments.

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Amount of goodwill at the balance sheet date before fresh-start adjustments.

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