Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified							6 Months Ended			6 Months Ended
	Jun. 30, 2014 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring	Dec. 31, 2013 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring	Jun. 30, 2014 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring Accrued Expenses	Dec. 31, 2013 Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring Accrued Expenses	Jun. 30, 2014 Fair Value, Inputs, Level 2	Dec. 31, 2013 Fair Value, Inputs, Level 2	Jun. 30, 2014 Interest rate swap contract	Jun. 30, 2014 Foreign Exchange Contract	Dec. 31, 2013 Foreign Exchange Contract	Jun. 30, 2014 Five-Year Credit Facility Expiring In September 2018	Jun. 30, 2014 Commercial Paper	Dec. 31, 2013 Commercial Paper
Derivative [Line Items]
Notional value of derivative contracts							$ 250.0	$ 271.4	$ 148.9
Fixed-rate notes interest percentage							2.875%
Fixed-rate notes due date							2016
Fair value of contingent consideration	117.7	95.7	104.8	10.3
Line of credit facility, borrowing capacity										750
Line of credit facility, expiration date										2018-09
Line of credit facility, term, in years										5 years
Commercial paper borrowings outstanding											181.5	0
Fair value of long-term debt including the effects of the related interest rate swap contract					$ 1,483.2	$ 1,435.4