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Financial Instruments - Summary Of Expected Losses (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses $ 322.8 $ 221.0
Not due    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 274.3 213.2
Up to 90 days    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 24.2 13.6
From 91 to 180 days [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 15.3 1.2
More than 180 days [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 21.2 2.8
Expected credit losses    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses (12.2) (9.8)
Commercial Aviation [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 192.4 89.6
Commercial Aviation [member] | Not due    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 176.2 90.9
Commercial Aviation [member] | Up to 90 days    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 9.8 4.5
Commercial Aviation [member] | From 91 to 180 days [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 9.9 0.3
Commercial Aviation [member] | More than 180 days [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 5.6 0.3
Commercial Aviation [member] | Expected credit losses    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses (9.1) (6.4)
Defence And Security [Member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 28.0 40.2
Defence And Security [Member] | Not due    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 14.0 35.5
Defence And Security [Member] | Up to 90 days    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 0.3 3.6
Defence And Security [Member] | From 91 to 180 days [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 2.2 0.3
Defence And Security [Member] | More than 180 days [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 12.0 1.2
Defence And Security [Member] | Expected credit losses    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses (0.5) (0.4)
Executive Aviation [Member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 50.5 39.4
Executive Aviation [Member] | Not due    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 45.8 37.6
Executive Aviation [Member] | Up to 90 days    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 5.7 3.1
Executive Aviation [Member] | From 91 to 180 days [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 0.5 0.4
Executive Aviation [Member] | More than 180 days [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 0.1 0.1
Executive Aviation [Member] | Expected credit losses    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses (1.6) (1.8)
OGMA Industria Aeronautica de Portugal SA [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 33.8 30.7
OGMA Industria Aeronautica de Portugal SA [member] | Not due    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 23.9 29.6
OGMA Industria Aeronautica de Portugal SA [member] | Up to 90 days    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 4.9 0.9
OGMA Industria Aeronautica de Portugal SA [member] | From 91 to 180 days [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 2.3 0.1
OGMA Industria Aeronautica de Portugal SA [member] | More than 180 days [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 3.2 1.1
OGMA Industria Aeronautica de Portugal SA [member] | Expected credit losses    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses (0.5) (1.0)
All other segments [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 18.1 21.1
All other segments [member] | Not due    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 14.4 19.6
All other segments [member] | Up to 90 days    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 3.5 1.5
All other segments [member] | From 91 to 180 days [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 0.4 0.1
All other segments [member] | More than 180 days [member]    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses 0.3 0.1
All other segments [member] | Expected credit losses    
Disclosure of provision matrix [line items]    
Trade Receivables And Expected Losses $ (0.5) $ (0.2)