Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Revision of Net Sales and Cost of Sales (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Products net sales	$ 5,326.0	$ 5,225.4	$ 5,255.5
Total net sales	6,939.6	6,833.0	6,880.7
Products cost of sales	4,260.5	4,101.7	4,122.3
Total cost of sales	$ 5,619.3	5,456.2	5,475.6
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Products net sales		5,288.1	5,312.1
Total net sales		6,895.7	6,937.3
Products cost of sales		4,164.4	4,178.9
Total cost of sales		5,518.9	5,532.2
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Products net sales		62.7	56.6
Total net sales		62.7	56.6
Products cost of sales		62.7	56.6
Total cost of sales		$ 62.7	$ 56.6