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Commitments - Schedule of Lease Contracts (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Disclosure Of Lease Contracts [Line Items]  
Undiscounted lease liabilities $ 447.4
Non-lease elements 472.1
Fully variable lease payments 1,943.3
Lease Contracts 2,853.8
Within one year [member]  
Disclosure Of Lease Contracts [Line Items]  
Undiscounted lease liabilities 63.9
Non-lease elements 98.7
Fully variable lease payments 502.3
Lease Contracts 664.9
Later than one and not later than five years [member]  
Disclosure Of Lease Contracts [Line Items]  
Undiscounted lease liabilities 178.2
Non-lease elements 290.1
Fully variable lease payments 1,410.3
Lease Contracts 1,878.6
Later than five years [member]  
Disclosure Of Lease Contracts [Line Items]  
Undiscounted lease liabilities 205.3
Non-lease elements 83.3
Fully variable lease payments 21.7
Lease Contracts $ 310.3