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Stockholders' Equity - Roll forward of Retained Earnings (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings beginning balance			$ 539.5
Net (loss) income	$ (4.9)	$ 23.3	(212.4)	$ 14.9
Distribution of MFS			51.2
Retained earnings ending balance	378.3		378.3
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings beginning balance			539.5	486.9
Net (loss) income			(212.4)	14.9
Retained earnings ending balance	$ 378.3	$ 501.8	$ 378.3	$ 501.8

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- 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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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=51831270

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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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