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Goodwill and Other Intangible Assets - Schedule of Finite-Lived and Indefinite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Intangible assets subject to amortization:    
Gross Carrying Amount $ 1,681.0 $ 1,686.4
Accumulated Amortization (786.8) (784.7)
Net Carrying Amount 894.2 901.7
Intangible assets not subject to amortization:    
Intangible assets not subject to amortization 61.7 100.6
Gross intangible assets (excluding goodwill) 1,742.7 1,787.0
Accumulated Amortization (786.8) (784.7)
Total intangible assets, net carrying amount 955.9 1,002.3
Trade names    
Intangible assets not subject to amortization:    
Intangible assets not subject to amortization 53.0 91.9
FAA air agency certificates    
Intangible assets not subject to amortization:    
Intangible assets not subject to amortization 8.7 8.7
Customer relationships    
Intangible assets subject to amortization:    
Gross Carrying Amount 828.2 863.0
Accumulated Amortization (319.1) (321.9)
Net Carrying Amount 509.1 541.1
Intangible assets not subject to amortization:    
Accumulated Amortization (319.1) (321.9)
Technology and know-how    
Intangible assets subject to amortization:    
Gross Carrying Amount 383.2 392.3
Accumulated Amortization (154.2) (152.6)
Net Carrying Amount 229.0 239.7
Intangible assets not subject to amortization:    
Accumulated Amortization (154.2) (152.6)
Trade names    
Intangible assets subject to amortization:    
Gross Carrying Amount 157.6 116.6
Accumulated Amortization (25.9) (23.6)
Net Carrying Amount 131.7 93.0
Intangible assets not subject to amortization:    
Accumulated Amortization (25.9) (23.6)
Capitalized software    
Intangible assets subject to amortization:    
Gross Carrying Amount 309.6 312.0
Accumulated Amortization (285.7) (284.9)
Net Carrying Amount 23.9 27.1
Intangible assets not subject to amortization:    
Accumulated Amortization (285.7) (284.9)
Other    
Intangible assets subject to amortization:    
Gross Carrying Amount 2.4 2.5
Accumulated Amortization (1.9) (1.7)
Net Carrying Amount 0.5 0.8
Intangible assets not subject to amortization:    
Accumulated Amortization $ (1.9) $ (1.7)