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Stockholders' Equity - Roll forward of Retained Earnings (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings beginning balance	$ 247.3
Net loss	(36.0)	$ (195.9)
Retained earnings ending balance	211.3
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings beginning balance	247.3	562.3
Net loss	(36.0)	(195.9)
Distribution of MFS		51.8
Retained earnings ending balance	$ 211.3	$ 418.2

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
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Amount of Net Income (Loss) attributable to noncontrolling interest.

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

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