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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)

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