Significant Accounting Policies - Summary of Liabilities Related to Integration Plans (Detail) $ in Millions	9 Months Ended
Sep. 30, 2015 USD ($)
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]
Beginning Balance	$ 0.0
Additions	154.2
Cash payments	(34.3)
Foreign currency exchange rate changes	(0.3)
Closing Balance	119.6
Employee Termination Benefits [Member]
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]
Beginning Balance	0.0
Additions	79.1
Cash payments	(28.4)
Foreign currency exchange rate changes	(0.1)
Closing Balance	50.6
Contract Terminations [Member]
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]
Beginning Balance	0.0
Additions	75.1
Cash payments	(5.9)
Foreign currency exchange rate changes	(0.2)
Closing Balance	$ 69.0

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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