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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation Allowance For Trade And Notes Receivable      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 6.3 $ 6.0 $ 3.7
Charged to Costs and Expenses   1.1 2.6
Acquisition of Businesses 0.2 0.2  
Deductions (1.2) (1.0) (0.3)
Balance at End of Year 5.3 6.3 6.0
Valuation Allowance For Deferred Tax Assets      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 13.1 11.0 9.8
Charged to Costs and Expenses 1.9 2.1 1.4
Acquisition of Businesses 1.9 2.1  
Deductions 0.0 0.0 (0.2)
Balance at End of Year $ 15.0 $ 13.1 $ 11.0