Goodwill and Other Intangible Assets - Schedule of Finite-Lived and Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Intangible assets subject to amortization:
Gross Carrying Amount	$ 1,521.8	$ 1,501.4
Accumulated Amortization	(651.3)	(616.4)
Net Carrying Amount	870.5	885.0
Intangible assets not subject to amortization:
Intangible assets not subject to amortization	97.2	146.4
Gross intangible assets (excluding goodwill)	1,619.0	1,647.8
Accumulated Amortization	(651.3)	(616.4)
Total intangible assets, net carrying amount	967.7	1,031.4
Trade names
Intangible assets not subject to amortization:
Intangible assets not subject to amortization	88.5	137.7
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	764.7	776.5
Accumulated Amortization	(243.9)	(222.8)
Net Carrying Amount	520.8	553.7
Intangible assets not subject to amortization:
Accumulated Amortization	(243.9)	(222.8)
Technology and know-how
Intangible assets subject to amortization:
Gross Carrying Amount	340.4	343.3
Accumulated Amortization	(110.1)	(100.9)
Net Carrying Amount	230.3	242.4
Intangible assets not subject to amortization:
Accumulated Amortization	(110.1)	(100.9)
Trade names
Intangible assets subject to amortization:
Gross Carrying Amount	103.8	71.3
Accumulated Amortization	(14.4)	(11.2)
Net Carrying Amount	89.4	60.1
Intangible assets not subject to amortization:
Accumulated Amortization	(14.4)	(11.2)
Capitalized software
Intangible assets subject to amortization:
Gross Carrying Amount	301.7	299.5
Accumulated Amortization	(273.6)	(272.8)
Net Carrying Amount	28.1	26.7
Intangible assets not subject to amortization:
Accumulated Amortization	(273.6)	(272.8)
Other
Intangible assets subject to amortization:
Gross Carrying Amount	11.2	10.8
Accumulated Amortization	(9.3)	(8.7)
Net Carrying Amount	1.9	2.1
Intangible assets not subject to amortization:
Accumulated Amortization	$ (9.3)	$ (8.7)