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Significant Accounting Policies - Summary of Liabilities Related to Integration Plans (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]  
Balance, December 31, 2016 $ 73.2
Additions 17.3
Cash payments (47.1)
Foreign currency exchange rate changes 1.7
Balance, December 31, 2017 45.1
Employee Termination Benefits [Member]  
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]  
Balance, December 31, 2016 38.1
Additions 12.1
Cash payments (36.7)
Foreign currency exchange rate changes 1.3
Balance, December 31, 2017 14.8
Contract Terminations [Member]  
Schedule Of Business Acquisitions Liabilities Related To Integration Plans [Line Items]  
Balance, December 31, 2016 35.1
Additions 5.2
Cash payments (10.4)
Foreign currency exchange rate changes 0.4
Balance, December 31, 2017 $ 30.3