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Accounts Receivable - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Revenue recognized in excess of billings on services contracts or unbilled accounts receivable $ 93.5 $ 100.1  
Leases Receivable, 2016 34.3    
Leases Receivable, 2017 32.8    
Leases Receivable, 2018 32.4    
Leases Receivable, 2019 14.4    
Leases Receivable, 2020 3.7    
Leases Receivable, thereafter 0.0    
Unearned income deducted from accounts and notes receivable 10.9 11.8  
Allowance for doubtful accounts 21.1 30.1  
Provision expense (income) for doubtful accounts reported in selling, general and administrative expenses $ 3.0 $ 2.7 $ (0.6)