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Discontinued Operations - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of taxes	$ (0.1)	$ (2.7)	$ 4.3	$ (3.1)
Discontinued Operations [Member]
Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of taxes			$ 4.3	$ (3.1)

Amount after tax of income (loss) from a discontinued operation attributable to the parent. 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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