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Segment Reporting - Reconciliation of Consolidated Segment Earnings to Consolidated Income Before Provision for Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Consolidated income before interest, other expense, provision for income taxes and equity in net income of affiliates $ 1,608.3 $ 1,427.2 $ 1,186.8
Interest expense 85.7 82.5 86.7
Other (income) expense, net (4.1) 6.4 68.6
Consolidated income before provision for income taxes and equity in net income of affiliates 1,526.7 1,338.3 1,031.5
Operating segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Consolidated income before interest, other expense, provision for income taxes and equity in net income of affiliates 1,892.4 1,727.3 1,461.4
Other      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Consolidated income before interest, other expense, provision for income taxes and equity in net income of affiliates $ (284.1) $ (300.1) $ (274.6)