Significant Accounting Policies - Summary of Liabilities Related to Integration Plans (Detail) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($)
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]
Balance at December 31, 2016	$ 73.2
Additions	12.0
Cash payments	(42.5)
Foreign currency exchange rate changes	1.6
Balance at September 30, 2017	44.3
Employee Termination Benefits [Member]
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]
Balance at December 31, 2016	38.1
Additions	12.0
Cash payments	(33.1)
Foreign currency exchange rate changes	1.2
Balance at September 30, 2017	18.2
Contract Terminations [Member]
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]
Balance at December 31, 2016	35.1
Cash payments	(9.4)
Foreign currency exchange rate changes	0.4
Balance at September 30, 2017	$ 26.1

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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