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Significant Accounting Policies - Summary of Liabilities Related to Integration Plans (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]  
Additions $ 196.0
Cash payments (93.1)
Foreign currency exchange rate changes (0.1)
Closing Balance 102.8
Employee Termination Benefits [Member]  
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]  
Additions 101.0
Cash payments (54.1)
Foreign currency exchange rate changes (0.1)
Closing Balance 46.8
Contract Terminations [Member]  
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]  
Additions 95.0
Cash payments (39.0)
Closing Balance $ 56.0