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Significant Accounting Policies - Summary of Liabilities Related to Integration Plans (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]  
Beginning Balance $ 73.2
Additions (3.0)
Cash payments (21.4)
Foreign currency exchange rate changes 0.4
Closing Balance 49.2
Employee Termination Benefits [Member]  
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]  
Beginning Balance 38.1
Additions (3.0)
Cash payments (17.8)
Foreign currency exchange rate changes 0.3
Closing Balance 17.6
Contract Terminations [Member]  
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]  
Beginning Balance 35.1
Cash payments (3.6)
Foreign currency exchange rate changes 0.1
Closing Balance $ 31.6