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Other Current Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Other Liabilities Disclosure [Abstract]    
Accrued payroll $ 62.7 $ 79.3
Accrued legal and regulatory 42.5 35.9
Accrued employee benefits 26.2 31.8
Deferred revenue 9.7 12.0
Contingent consideration 8.6 16.1
Income taxes payable 6.6 11.5
Accrued interest 1.0 1.3
Other 16.3 20.8
Total other current liabilities $ 173.6 $ 208.7