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Stockholders' Equity - Roll forward of Retained Earnings (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings beginning balance			$ 247.3	$ 562.3
Net income (loss)	$ 9.6	$ (140.7)	(25.9)	(342.4)
Distribution of MFS				51.2
Retained earnings ending balance	$ 221.4	$ 271.1	$ 221.4	$ 271.1

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

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- Definition

The change in equity as a result of a spin-off transaction (a regular or reverse spin-off) which is based on the recorded amounts.

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