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Goodwill and Other Intangible Assets - Schedule of Finite-Lived and Indefinite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Intangible assets subject to amortization:    
Gross Carrying Amount $ 1,691.1 $ 1,596.6
Accumulated Amortization (770.0) (686.1)
Net Carrying Amount 921.1 910.5
Intangible assets not subject to amortization:    
Intangible assets not subject to amortization 100.5 96.0
Gross intangible assets (excluding goodwill) 1,791.6 1,692.6
Accumulated Amortization (770.0) (686.1)
Total intangible assets, net carrying amount 1,021.6 1,006.5
Trade names    
Intangible assets not subject to amortization:    
Intangible assets not subject to amortization 91.8 87.3
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 861.6 805.7
Accumulated Amortization (309.1) (262.9)
Net Carrying Amount 552.5 542.8
Intangible assets not subject to amortization:    
Accumulated Amortization (309.1) (262.9)
Technology and know-how    
Intangible assets subject to amortization:    
Gross Carrying Amount 391.8 369.6
Accumulated Amortization (146.1) (120.4)
Net Carrying Amount 245.7 249.2
Intangible assets not subject to amortization:    
Accumulated Amortization (146.1) (120.4)
Trade names    
Intangible assets subject to amortization:    
Gross Carrying Amount 116.5 107.5
Accumulated Amortization (22.1) (16.9)
Net Carrying Amount 94.4 90.6
Intangible assets not subject to amortization:    
Accumulated Amortization (22.1) (16.9)
Capitalized software    
Intangible assets subject to amortization:    
Gross Carrying Amount 310.9 302.8
Accumulated Amortization (283.3) (276.1)
Net Carrying Amount 27.6 26.7
Intangible assets not subject to amortization:    
Accumulated Amortization (283.3) (276.1)
Other    
Intangible assets subject to amortization:    
Gross Carrying Amount 10.3 11.0
Accumulated Amortization (9.4) (9.8)
Net Carrying Amount 0.9 1.2
Intangible assets not subject to amortization:    
Accumulated Amortization $ (9.4) $ (9.8)