Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Business And Significant Accounting Policies [Line Items]
Intangible asset impairment		$ 28.0
Reclassification of other current assets to debt			$ 9.2
Decrease in long-term debt			58.9
Reclassification of other assets to debt			$ 49.7
Provision for income tax expense benefit	$ 4.0	6.9
Increase in net cash provided by operating activities		12.4
Increase in net cash provided by financing activities		12.4
Employee Severance [Member]
Business And Significant Accounting Policies [Line Items]
Restructuring Cost	170.0	170.0
Cumulative restructuring cost	108.2	108.2
Contract Terminations [Member]
Business And Significant Accounting Policies [Line Items]
Restructuring Cost	130.0	130.0
Cumulative restructuring cost	120.3	120.3
In Process Research and Development (IPR&D) [Member]
Business And Significant Accounting Policies [Line Items]
Intangible assets recognized as part of merger	209.0	$ 209.0
Intangible asset impairment	$ 28.0