Financial Instruments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($) Country	Dec. 31, 2016 USD ($)
Commercial Paper
Derivative [Line Items]
Commercial paper borrowings outstanding	$ 110,000,000	$ 0
Five Year Credit Facility Expiring In November 2021
Derivative [Line Items]
Line of credit facility, borrowing capacity	$ 1,000,000,000
Line of credit facility, expiration date	2021-11
Line of credit facility, term, in years	5 years
National Healthcare Systems and Private Sector Customers | Spain, Italy, Greece, and Portugal
Derivative [Line Items]
Accounts receivable, net	$ 40,100,000
Accounts receivable greater than 365 days past due	$ 1,900,000
The number of countries in Europe in which certain collection risks exist | Country	4
Medicon Inc | Other Long-term Liabilities
Derivative [Line Items]
Liability for deferred future payments for business combinations	$ 41,400,000	39,500,000
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Derivative [Line Items]
Fair value of contingent consideration	14,800,000	14,900,000
Fair Value, Inputs, Level 2
Derivative [Line Items]
Fair value of long-term debt including current maturities	1,695,200,000	1,688,000,000
Fair Value, Inputs, Level 2 | Forward currency contracts | Fair Value, Measurements, Recurring
Derivative [Line Items]
Fair values of forward currency contracts	12,800,000	8,600,000
Fair Value, Inputs, Level 2 | Medicon Inc
Derivative [Line Items]
Liability for deferred future payments for business combinations	54,800,000	52,300,000
Foreign Exchange Contract
Derivative [Line Items]
Notional value of derivative contracts	$ 218,600,000	$ 243,200,000