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Discontinued Operations - Major classes of line items constituting earnings from discontinued operations before income taxes related to MFS (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Business Disposed Prior to 2014
Results of discontinued operations
(Loss) income from discontinued operations, net of income taxes	$ (1.0)	$ 0.0

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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