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Stockholders' Equity - Roll forward of Retained Earnings (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained earnings beginning balance			$ 256.7
Net income	$ 11.5	$ 9.6	11.2	$ (25.9)
Retained earnings ending balance	$ 267.9		$ 267.9

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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.

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- Definition

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

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

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