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Discontinued Operations - Assets and Liabilities of Discontinued Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Discontinued operations
Earnings (loss) from discontinued operations, net of income taxes		$ 0.6	$ 24.9
Discontinued Operations
Discontinued operations
Assets	$ 0.0	0.0
Liabilities	0.0	$ 0.0
Earnings (loss) from discontinued operations, net of income taxes	$ 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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