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Asset Impairments and Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Asset impairment charges related to core technologies associated with biopsy business, pre tax	$ 13.2
Asset impairment charges related to core technologies associated with biopsy business, after tax	8.0
Asset impairment charges related to assets not related to operations, pre tax		9.0
Asset impairment charges related to assets not related to operations, after tax		5.8
Remaining liability related to restructuring charge	1.0		1.0
Cash payments related to restructuring charges			4.8
Reversal of restructuring costs			$ 1.6

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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