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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of costs incurred to date for the specified restructuring cost.

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Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Business And Significant Accounting Policies [Line Items]
Intangible asset impairment	$ 26.8	$ 28.0	$ 26.8	$ 28.0
Provision for income taxes	(12.3)	(142.2)	21.8	(188.3)
ASU 2016-16 [Member]
Business And Significant Accounting Policies [Line Items]
Provision for income taxes	1.8		3.6
Retained Earnings [Member] \| ASU 2016-16 [Member]
Business And Significant Accounting Policies [Line Items]
Cumulative effect of Retained earnings on new accounting principle adoption	(72.7)		(72.7)
Prepaid Expenses and Other Current Assets [Member] \| ASU 2016-16 [Member]
Business And Significant Accounting Policies [Line Items]
Cumulative effect of Retained earnings on new accounting principle adoption	(3.9)		(3.9)
Other Assets [Member] \| ASU 2016-16 [Member]
Business And Significant Accounting Policies [Line Items]
Cumulative effect of Retained earnings on new accounting principle adoption	(22.4)		(22.4)
Income Taxes Payable [Member] \| ASU 2016-16 [Member]
Business And Significant Accounting Policies [Line Items]
Cumulative effect of Retained earnings on new accounting principle adoption	(2.0)		(2.0)
Deferred Income Taxes [Member] \| ASU 2016-16 [Member]
Business And Significant Accounting Policies [Line Items]
Cumulative effect of Retained earnings on new accounting principle adoption	48.4		48.4
Employee Severance [Member]
Business And Significant Accounting Policies [Line Items]
Restructuring Cost	170.0		170.0
Cumulative restructuring cost	158.4		158.4
Contract Terminations [Member]
Business And Significant Accounting Policies [Line Items]
Restructuring Cost	140.0		140.0
Cumulative restructuring cost	134.9		134.9
In Process Research and Development (IPR&D) [Member]
Business And Significant Accounting Policies [Line Items]
Intangible assets	209.0		209.0
Intangible asset impairment	18.8	$ 28.0	18.8	$ 28.0
Trademarks [Member]
Business And Significant Accounting Policies [Line Items]
Intangible assets	479.0		$ 479.0
Intangible asset impairment	$ 8.0