Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Intangible assets subject to amortization:
Gross Carrying Amount	$ 1,168.6	$ 1,144.7
Accumulated Amortization	(557.3)	(540.9)
Net Carrying Amount	611.3	603.8
Intangible assets not subject to amortization:
Intangible assets not subject to amortization	144.0	161.5
Gross intangible assets (excluding goodwill)	1,312.6	1,306.2
Accumulated Amortization	(557.3)	(540.9)
Total intangible assets, net carrying amount	755.3	765.3
Trade names
Intangible assets not subject to amortization:
Intangible assets not subject to amortization	135.3	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	567.1	561.5
Accumulated Amortization	(190.6)	(183.2)
Net Carrying Amount	376.5	378.3
Intangible assets not subject to amortization:
Accumulated Amortization	(190.6)	(183.2)
Technology and know-how
Intangible assets subject to amortization:
Gross Carrying Amount	272.0	273.1
Accumulated Amortization	(85.3)	(80.4)
Net Carrying Amount	186.7	192.7
Intangible assets not subject to amortization:
Accumulated Amortization	(85.3)	(80.4)
Trade names
Intangible assets subject to amortization:
Gross Carrying Amount	31.8	18.4
Accumulated Amortization	(9.1)	(8.7)
Net Carrying Amount	22.7	9.7
Intangible assets not subject to amortization:
Accumulated Amortization	(9.1)	(8.7)
Capitalized software
Intangible assets subject to amortization:
Gross Carrying Amount	290.0	288.4
Accumulated Amortization	(268.0)	(266.3)
Net Carrying Amount	22.0	22.1
Intangible assets not subject to amortization:
Accumulated Amortization	(268.0)	(266.3)
Other
Intangible assets subject to amortization:
Gross Carrying Amount	7.7	3.3
Accumulated Amortization	(4.3)	(2.3)
Net Carrying Amount	3.4	1.0
Intangible assets not subject to amortization:
Accumulated Amortization	$ (4.3)	$ (2.3)