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Change in Liability for Contingent Consideration (Detail) - Contingent Consideration Liability From Business Acquisitions - Fair Value, Inputs, Level 3 - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, January 1 $ 11.2 $ 23.1
Purchase price contingent consideration 17.1 5.7
Payments (2.3) (8.0)
Change in fair value of contingent consideration (11.1) (9.6)
Balance, December 31 $ 14.9 $ 11.2