Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Intangible assets subject to amortization:
Gross Carrying Amount	$ 995.3	$ 1,087.8
Accumulated Amortization	(520.2)	(550.4)
Net Carrying Amount	475.1	537.4
Intangible assets not subject to amortization:
Intangible assets not subject to amortization	119.6	131.4
Gross intangible assets (excluding goodwill)	1,114.9	1,219.2
Accumulated Amortization	(520.2)	(550.4)
Total intangible assets, net carrying amount	594.7	668.8
Trade names
Intangible assets not subject to amortization:
Intangible assets not subject to amortization	110.9	122.7
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	459.4	518.1
Accumulated Amortization	(172.0)	(189.3)
Net Carrying Amount	287.4	328.8
Intangible assets not subject to amortization:
Accumulated Amortization	(172.0)	(189.3)
Technology and know-how
Intangible assets subject to amortization:
Gross Carrying Amount	230.7	270.7
Accumulated Amortization	(74.2)	(86.6)
Net Carrying Amount	156.5	184.1
Intangible assets not subject to amortization:
Accumulated Amortization	(74.2)	(86.6)
Trade names
Intangible assets subject to amortization:
Gross Carrying Amount	18.5	14.3
Accumulated Amortization	(7.3)	(9.6)
Net Carrying Amount	11.2	4.7
Intangible assets not subject to amortization:
Accumulated Amortization	(7.3)	(9.6)
Capitalized software
Intangible assets subject to amortization:
Gross Carrying Amount	283.6	280.0
Accumulated Amortization	(264.3)	(261.3)
Net Carrying Amount	19.3	18.7
Intangible assets not subject to amortization:
Accumulated Amortization	(264.3)	(261.3)
Other
Intangible assets subject to amortization:
Gross Carrying Amount	3.1	4.7
Accumulated Amortization	(2.4)	(3.6)
Net Carrying Amount	0.7	1.1
Intangible assets not subject to amortization:
Accumulated Amortization	$ (2.4)	$ (3.6)