Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Intangible assets subject to amortization:
Gross Carrying Amount	$ 1,305.2	$ 1,144.7
Accumulated Amortization	(573.6)	(540.9)
Net Carrying Amount	731.6	603.8
Intangible assets not subject to amortization:
Intangible assets not subject to amortization	144.5	161.5
Gross intangible assets (excluding goodwill)	1,449.7	1,306.2
Accumulated Amortization	(573.6)	(540.9)
Total intangible assets, net carrying amount	876.1	765.3
Trade names
Intangible assets not subject to amortization:
Intangible assets not subject to amortization	135.8	152.8
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	655.8	561.5
Accumulated Amortization	(201.3)	(183.2)
Net Carrying Amount	454.5	378.3
Intangible assets not subject to amortization:
Accumulated Amortization	(201.3)	(183.2)
Technology and know-how
Intangible assets subject to amortization:
Gross Carrying Amount	301.2	273.1
Accumulated Amortization	(90.1)	(80.4)
Net Carrying Amount	211.1	192.7
Intangible assets not subject to amortization:
Accumulated Amortization	(90.1)	(80.4)
Trade names
Intangible assets subject to amortization:
Gross Carrying Amount	50.6	18.4
Accumulated Amortization	(9.8)	(8.7)
Net Carrying Amount	40.8	9.7
Intangible assets not subject to amortization:
Accumulated Amortization	(9.8)	(8.7)
Capitalized software
Intangible assets subject to amortization:
Gross Carrying Amount	290.0	288.4
Accumulated Amortization	(267.0)	(266.3)
Net Carrying Amount	23.0	22.1
Intangible assets not subject to amortization:
Accumulated Amortization	(267.0)	(266.3)
Other
Intangible assets subject to amortization:
Gross Carrying Amount	7.6	3.3
Accumulated Amortization	(5.4)	(2.3)
Net Carrying Amount	2.2	1.0
Intangible assets not subject to amortization:
Accumulated Amortization	$ (5.4)	$ (2.3)