Restructuring and Asset Impairments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Reversal of restructuring costs			$ 1.4
Asset impairments, total	6.2	3.4	3.2	5.7	6.8	12.3	22.2
Asset impairments, total, net of tax						9.5	13.8
Core Technologies
Restructuring Cost and Reserve [Line Items]
Impairment of Intangible Assets, Finite Lived						6.4	13.2
Impairment of Intangible Assets, Finite Lived, Net of Tax						4.9	8.0
Equipment And Inventory
Restructuring Cost and Reserve [Line Items]
Impairment of tangible Assets						2.5
Impairment of tangible Assets, net of tax						2.4
Assets Not Related To Operations
Restructuring Cost and Reserve [Line Items]
Impairment of tangible Assets							9.0
Impairment of tangible Assets, net of tax							5.8
In-Process Research And Development
Restructuring Cost and Reserve [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)					6.8	3.4
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill), Net of Tax					4.3	2.2
2012 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Total cost of restructuring							19.2
Employee separation and other costs related to one time employee termination benefits, after tax							13.0
Reversal of restructuring costs						$ 2.1