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Revenue from Contracts with Customers - Summary of Contract balances, including contract costs (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Contract assets $ 358.0 $ 447.5 $ 370.6  
Contract costs (Other assets) 9.1 7.6 6.5  
Contract liabilities 1,243.6 1,126.6 1,244.8  
Customer advances 1,057.4 938.1 911.3  
Deferred revenue 186.2 188.5 333.5  
Financial guarantee 152.1 156.8 210.8 $ 293.1
Financial guarantee [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Financial guarantee $ 11.6 $ 17.1 $ 22.7 $ 40.1