Significant Accounting Policies - Summary of Liabilities Related to Integration Plans (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]
Beginning Balance	$ 102.8
Additions	14.2
Cash payments	(45.3)
Foreign currency exchange rate changes	0.3
Closing Balance	72.0
Employee Termination Benefits [Member]
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]
Beginning Balance	46.8
Additions	4.1
Cash payments	(19.2)
Foreign currency exchange rate changes	0.2
Closing Balance	31.9
Contract Terminations [Member]
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]
Beginning Balance	56.0
Additions	10.1
Cash payments	(26.1)
Foreign currency exchange rate changes	0.1
Closing Balance	$ 40.1