Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Intangible assets subject to amortization:
Gross Carrying Amount	$ 1,144.7	$ 1,087.8
Accumulated Amortization	(540.9)	(550.4)
Net Carrying Amount	603.8	537.4
Intangible assets not subject to amortization:
Intangible assets not subject to amortization	161.5	131.4
Gross intangible assets (excluding goodwill)	1,306.2	1,219.2
Accumulated Amortization	(540.9)	(550.4)
Total intangible assets, net carrying amount	765.3	668.8
Trade names
Intangible assets not subject to amortization:
Intangible assets not subject to amortization	152.8	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	561.5	518.1
Accumulated Amortization	(183.2)	(189.3)
Net Carrying Amount	378.3	328.8
Intangible assets not subject to amortization:
Accumulated Amortization	(183.2)	(189.3)
Technology and know-how
Intangible assets subject to amortization:
Gross Carrying Amount	273.1	270.7
Accumulated Amortization	(80.4)	(86.6)
Net Carrying Amount	192.7	184.1
Intangible assets not subject to amortization:
Accumulated Amortization	(80.4)	(86.6)
Trade names
Intangible assets subject to amortization:
Gross Carrying Amount	18.4	14.3
Accumulated Amortization	(8.7)	(9.6)
Net Carrying Amount	9.7	4.7
Intangible assets not subject to amortization:
Accumulated Amortization	(8.7)	(9.6)
Capitalized Software
Intangible assets subject to amortization:
Gross Carrying Amount	288.4	280.0
Accumulated Amortization	(266.3)	(261.3)
Net Carrying Amount	22.1	18.7
Intangible assets not subject to amortization:
Accumulated Amortization	(266.3)	(261.3)
Other
Intangible assets subject to amortization:
Gross Carrying Amount	3.3	4.7
Accumulated Amortization	(2.3)	(3.6)
Net Carrying Amount	1.0	1.1
Intangible assets not subject to amortization:
Accumulated Amortization	$ (2.3)	$ (3.6)