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Commitments - Schedule of Lease Contracts (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Lease Contracts [Line Items]    
Undiscounted lease liabilities $ 578.3 $ 447.4
Non-lease elements 498.2 472.1
Fully variable lease payments 2,089.3 1,934.3
Lease Contracts 3,165.8 2,853.8
Within one year [member]    
Disclosure Of Lease Contracts [Line Items]    
Undiscounted lease liabilities 88.4 63.9
Non-lease elements 126.0 98.7
Fully variable lease payments 583.0 502.3
Lease Contracts 797.4 664.9
Later than one and not later than five years [member]    
Disclosure Of Lease Contracts [Line Items]    
Undiscounted lease liabilities 228.7 178.2
Non-lease elements 296.3 290.1
Fully variable lease payments 1,506.3 1,410.3
Lease Contracts 2,031.3 1,878.6
Later than five years [member]    
Disclosure Of Lease Contracts [Line Items]    
Undiscounted lease liabilities 261.2 205.3
Non-lease elements 75.9 83.3
Fully variable lease payments 0.0 21.7
Lease Contracts $ 337.1 $ 310.3