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Significant Accounting Policies - Summary of Liabilities Related to Integration Plans (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]  
Beginning Balance $ 102.8
Additions 43.1
Cash payments (85.3)
Foreign currency exchange rate changes (0.3)
Closing Balance 60.3
Employee Termination Benefits [Member]  
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]  
Beginning Balance 46.8
Additions 14.3
Cash payments (30.3)
Foreign currency exchange rate changes (0.4)
Closing Balance 30.4
Contract Terminations [Member]  
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]  
Beginning Balance 56.0
Additions 28.8
Cash payments (55.0)
Foreign currency exchange rate changes 0.1
Closing Balance $ 29.9